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Sharp-shinned hawk

A juvenile sharp-shinned hawk in Parrish, Florida.

Click for animation of feeding sharp-shinned hawk

Immature (nominate group)

Endangered subspecies venator, endemic to Puerto Rico

Acropora

Close-up of a network of Acropora polyps

Aequipecten

Small purple colored thresher caught at Pacifica Pier, California

Ambystoma kansensis (Adams 1929) fossil

Tiger salamander (Ambystoma tigrinum)

Phylogenetic tree showing relations among Ambystoma species and outgroups: For example, the sister taxon to Ambystoma macrodactylum is Ambystoma laterale, meaning they share a single common ancestor and are each other's closest living relatives.

Yellow-billed duck, Anas undulata

Northern pintail, Anas acuta

Green-winged teal, Anas carolinensis

Anas blanchardi fossil

Eurasian teal

Green-winged teal ( A. carolinensis), drake in nuptial plumage (note vertical white stripe from shoulder)

Female, WWT Slimbridge

Male in nuptial plumage (above) and female.
Note typical wide white wing stripe and conspicuous face markings of male, the colours of which give the name to the colour teal.

Drake in eclipse plumage (rightmost bird), hen and young

Wintering birds at Purbasthali, Burdwan District of West Bengal ( India)

An American black duck (top left) and a male mallard (bottom right) in eclipse plumage

Juvenile

Iridescent speculum feathers of the male

A group of mallards quacking

Owing to their highly 'malleable' genetic code, mallards can display a large amount of variation,^[1] as seen here with this female, who displays faded or 'apricot' plumage.

Male mallard, Sweden 2016

Female Mallard with five ducklings (Lac Archambeault, Québec)

Egg, Collection Museum Wiesbaden

Illustration by Carl Friedrich Deiker (1875)

Several drakes swim in a pond.

The last male Mariana mallard

George Hetzel, Mallard still life painting, 1883–1884

Map of the Roman Empire under Hadrian (ruled 117–138), showing the then homeland of the Angles (Anglii) on the Jutland peninsula in today's Germany and Denmark

The map shows both the Anglia (Angeln) and the Schwansen peninsulas

Possible locations of the Angles and Jutes before their migration to Britain.

Manuscript of Bede

Angles, Saxons and Jutes throughout England

Anolis

Carolina anole

Anolis carolinensis on Star Jasmine, South Carolina, demonstrating camouflage

Carolina anoles fighting

Anole displaying at its reflection

Carolina anole licking

Carolina anole eating a moth

Carolina anole eating a dragonfly

Carolina anoles mating

Juvenile male

Aphelops

Typical freshwater drum, Lake Jordan, Alabama (released)

Architectonica perspectiva

Architectonica (Maxima-group) consobrina

Architectonica plicata, a fossil species from the London Clay, Eocene; Barton cliff, Hampshire, England

Restoration of Arctodus simus

The combined area of these three shapes is approximately 15.57 squares.

A square metre quadrat made of PVC pipe.

Although there are 10 mm in 1 cm, there are 100 mm² in 1 cm².

A rectangle with length and width labelled

The area of this rectangle is

lw

.

A diagram showing how a parallelogram can be re-arranged into the shape of a rectangle

Equal area figures.

Two equal triangles.

A circle divided into many sectors can be re-arranged roughly to form a parallelogram

A circle can be divided into sectors which rearrange to form an approximate parallelogram.

Archimedes showed that the surface area of a sphere is exactly four times the area of a flat disk of the same radius, and the volume enclosed by the sphere is exactly 2/3 of the volume of a cylinder of the same height and radius.

Integration can be thought of as measuring the area under a curve, defined by f(x), between two points (here a and b).

A diagram showing the area between two functions

The area between two graphs can be evaluated by calculating the difference between the integrals of the two functions

American mastodon arm bone with A. simus tooth marks

Argyrotheca

3-lobed larval phase of Argyrotheca cordata, 180μm, lateral view, top apical lobe with long cilia, mid-section mantel lobe, with ventral cilia (left) and 4 bundles of setae (2 visible), bottom pedical lobe, without cilia

Figurine of Astarte with a horned headdress, Louvre Museum

Astarte riding in a chariot with four branches protruding from roof, on the reverse of a Julia Maesa coin from Sidon

Fragment of a crudely carved limestone stela showing king Thutmose IV adoring a goddess (probably Astarte). From Thebes, Egypt. 18th Dynasty. The Petrie Museum of Egyptian Archaeology, London

Phoenician figure representing an ancient Mideastern deity, probably the goddess Astarte, called the Lady of Galera ( National Archaeological Museum of Spain)

Ring-necked duck female Houston, Texas

Drake canvasback stretching wings

Tubers of Sago Pondweed (Stuckenia pectinata), a favorite food of the canvasback

Baculites

Baculites specimen in the field; western South Dakota, Pierre Shale, Late Cretaceous. Part of the phragmocone (left) and part of the body chamber (right) are present.

Baculites showing sutures and remnant aragonite; western South Dakota, Late Cretaceous.

Baculites from the Late Cretaceous of Wyoming. The original aragonite of the outer conch and inner septa has dissolved away, leaving this articulated internal mold.

Balanus

Barbatia foliata

Ripening Ascolano olives in Corning, California.

Barnea at veraison

Coratina at different stages of ripening

Upland sandpiper

Call

B. isis jaw muscles

Caudal vertebra from Owen 1839

Skeleton of B. isis at Wadi El Hitan

Albert Koch's "Hydrarchos" fossil skeleton from 1845

B. isis hind limb

Ruffed Grouse by John J. Audubon c. 1861

Grey morph

Displaying male

Egg, Collection Museum Wiesbaden

Nest with large clutch

Snow hole and wing tracks of a grouse as it burst out of the snow when approached

Canada goose

Yellow plumage of gosling

In the grass in East Hills, New York

On Spokane River, Washington State

Flock in flight

Nesting in Wales

Approaching to beg for food in a Manchester park, a learned behavior

Cleaning feathers, Oxfordshire

Male goose carefully watches nearby humans in Winnipeg

Eggs, collection Museum Wiesbaden, Germany

Goslings

Geese and goslings in an English canal, showing formation

Resting in a pond during spring migration, Ottawa, Ontario

Low flyover by five Canada geese

Canada geese instinctively nest on higher ground near water. This female is nesting on a beaver lodge.

Family in builders' yard, Salem, Oregon: The mother goose had built a nest on an aggregate pile.

Roosting in a parking lot

A Canada goose feather recovered from Engine #1 of the Airbus A320 involved in US Airways Flight 1549. The aircraft was ditched in the Hudson River after its engines ingested several Canada geese.

Ruffed Grouse by John J. Audubon c. 1861

Grey morph

Displaying male

Egg, Collection Museum Wiesbaden

Nest with large clutch

Snow hole and wing tracks of a grouse as it burst out of the snow when approached

Canada goose

Yellow plumage of gosling

In the grass in East Hills, New York

On Spokane River, Washington State

Flock in flight

Nesting in Wales

Approaching to beg for food in a Manchester park, a learned behavior

Cleaning feathers, Oxfordshire

Male goose carefully watches nearby humans in Winnipeg

Eggs, collection Museum Wiesbaden, Germany

Goslings

Geese and goslings in an English canal, showing formation

Resting in a pond during spring migration, Ottawa, Ontario

Low flyover by five Canada geese

Canada geese instinctively nest on higher ground near water. This female is nesting on a beaver lodge.

Family in builders' yard, Salem, Oregon: The mother goose had built a nest on an aggregate pile.

Roosting in a parking lot

A Canada goose feather recovered from Engine #1 of the Airbus A320 involved in US Airways Flight 1549. The aircraft was ditched in the Hudson River after its engines ingested several Canada geese.

Anaxyrus fowleri

Fowler's toad in leaf litter

Eastern American Toad in Ohio

Detail of parotoid glands

Fossil shell of Bathytoma cataphracta from Pliocene of Italy

Drawing of a dorsal view of a living animal of Calliostoma bairdii dredged in the Atlantic Ocean at a depth of from 100 m to 1170 m.

Rare purple beaded specimen of Calliostoma supragranosum found subtidally in Southern California.

A detached bell tower (campanile) at the University of Kansas

The Santo Tomás parish church in Haro, La Rioja has an exconjuratory in its bell tower

Shafer Tower at Ball State University in Muncie, Indiana

Cancellaria

Cancellaria (Euclia) balboae

Skulls of dire wolf (C. dirus), gray wolf (C. lupus), eastern wolf (C. lycaon), red wolf (C. rufus), coyote (C. latrans), African golden wolf (C. anthus), golden jackal (C. aureus) and black-backed jackal (C. mesomelas)

Diagram of a wolf skull with key features labelled

Eurasian wolf skull

Dentition of a wolf showing functions of the teeth.

Comparative image of the red wolf (C. rufus) & the coyote (C. latrans). A 2016 genetic study of canid scats found that despite high coyote density inside the Red Wolf Experimental Population Area (RWEPA), hybridization occurs rarely (4% are hybrids).^[2]

Skulls of North American Canis, with red wolf in the center

Red wolf in forest

Red wolf

Historical range of the red wolf (Canus rufus)

Audubon's depiction of the species (1851)

Melanistic individual at the Audubon Park, New Orleans (1931)

USFWS worker with red wolf pups, August 2002

Capulus danieli

Grey reef shark (Carcharhinus amblyrhynchos)

Caribbean reef shark (Carcharhinus perezi)

Fossil teeth of Carcharias holmdelensis from Israel, Upper Cretaceous

Fossil teeth of Carcharias samhammeri from Israel, Upper Cretaceous

Fossil teeth of Carcharias tingitana from Morocco, Paleogene

A cast of C. ohioensis assembled from various specimens

Skeleton in Minnesota Science Museum

Mounted skeleton

Fossil shells of Cerithium crenatum from Pliocene of Italy

50 second video of snails (most likely Natica chemnitzi and Cerithium muscarum) feeding on the sea floor in the Gulf of California, Puerto Peñasco, Mexico

50 second video of snails (most likely Natica chemnitzi and Cerithium stercusmuscaram) feeding on the sea floor in the Gulf of California, Puerto Peñasco, Mexico

Skeleton of Cervus elaphus found at Għar Dalam

Stag and hinds

A group of hinds with calves

Two males roaring

Red deer mating

juvenile

The Monarch of the Glen, 1851, by Sir Edwin Landseer, an iconic image of the 19th century

Rustic deer antler candle holder

X-ray image of the shell of Charonia lampas

The struggle between a starfish and an Atlantic triton can last up to an hour before the seastar is subdued by the snail's paralyzing saliva.

Fossil shell of Charonia appenninica from Pliocene of Italy

Two individuals of Acanthopleura granulata on a rock at high tide level in Guadeloupe

Loose valves or plates of Chiton tuberculatus from the beachdrift on Nevis, West Indies, head plates at the top, tail plates at the bottom

Prepared chiton shell with structure of plates clearly visible.

The underside of the gumboot chiton, Cryptochiton stelleri, showing the foot in the center, surrounded by the gills and mantle: The mouth is visible to the left in this image.

Cryptoconchus porosus, a butterfly chiton, which has its valves completely covered by the girdle

Larvae of chitons: First image is the trochophore, second is in metamorphosis, third is an immature adult.

Separate plates from Matthevia, a Late Cambrian polyplacophoran from the Hellnmaria Member of the Notch Peak Limestone, Steamboat Pass, southern House Range, Utah are shown with a US one-cent coin (19 mm in diameter).

Hermes wearing a chlamys

King David in the Paris Psalter, 10th century AD

The painted turtle's yellow face-stripes, philtrum (nasal groove), and foot webbing

Male southern painted turtle shows his long front claws

Female painted turtle

A female digging a nest

Hatchling painted turtles

Basking for warmth

Moving on land

Native range of the painted turtle (C. picta)
Dark grey for national borders
White for state and province borders
Dark blue for rivers, only showing those in article

Eastern (C. p. picta)

Midland (C. p. marginata)

Southern (C. p. dorsalis)

Western (C. p. bellii)

Intergrade mixtures (large areas only)

Mix of eastern and midland

Mix of eastern and southern

Mix of midland and western

Eastern painted turtle in Massachusetts

Western painted turtle (watercolor by G. Aeschimann)

Western painted turtle in Oregon

Painted turtle habitat in New Hampshire

Shell marking code

German naturalist Johann Gottlob Schneider first categorized the painted turtle.

Top and bottom shell fossils, about 5 million years old, from a Tennessee sinkhole^[3]

British Columbia road sign (for painted turtle protection)

Oregon conservation video: If video play problematic, try external links within citations.^[4]^[5] Note list of factors at 0:30–0:60 and hoop trap at 1:50–2:00.

Basking trap in Minnesota

A large turtle statue standing on two legs and holding a Canadian flag in one hand an American flag in the other.

Tommy the Turtle

Cidaris cidaris

Colinus

Plate 76 of Birds of America by John James Audubon depicting Virginian Partridge.

Egg

Closeup of the head of Coluber constrictor mormon

Northern Black Racer, C. c. constrictor

Conus

Corvina

Example of varietal wine produced from Corvina

Hooded crow (Corvus cornix) in flight

Jungle crow (Corvus macrorhynchos) scavenging on a dead shark at a beach in Kumamoto, Japan

Crow on a branch

Close-up of the upper body of a jackdaw (Corvus monedula)

House crow ( Corvus splendens), Bangalore

Indian crow in Tamil Nadu

Corvus splendens or house crow resting in shadows on a rooftop with slaughterhouse refuse to eat

Nestlings, almost ready to fledge

A crow's nest is made of materials like twigs, electrical wires, metal strips, plastic pieces, and other small items.

The Hawaiian crow or ʻalala (Corvus hawaiiensis) is nearly extinct; only a few dozen birds survive in captivity. It is listed as "extinct in the wild" by the United States Fish and Wildlife Service.

Crow on a Branch - Kawanabe Kyosai (1831–1889)

Crow on a branch, Maruyama Ōkyo (1733–1795)

Dhumavati

The Twa Corbies by Arthur Rackham

In sunlight, the plumage can display a blue or purple sheen which is a result of iridescence.

Vocalising

Two juveniles in Iceland

Group of ravens gathered around dead member

Young on a nest – Hvítserkur, Iceland

Eggs of Corvus corax

Feeding

Flock feeding at a garbage dump

Dilapidated NIKE Missile radar dome in Alaska with an evening roost

Bill Reid's sculpture The Raven and The First Men, showing part of a Haida creation myth. Museum of Anthropology, University of British Columbia.

Valkyrie speaks with a raven in a 19th-century illustration of the Old Norse poem Hrafnsmál ("raven song") by Frederick Sandys

C. oweni skull

Skull of C. elephantopus

Individual walking towards a swamp, Robert Bruce Horsfall

Restoration by Charles R. Knight

Crassostrea

Crassostrea gigantissima (Finch, 1824) right valve interior (Eocene of Texas).

Crepidula

Crepidula immersa, now Maoricypta or Zeacrypta

Adult Crotalus horridus, Florida

Juvenile Crotalus horridus, Florida

Skeleton and model

The small eyes and loose skin are characteristic of hellbenders

Hellbender on display at the Smithsonian National Zoological Park, Washington, DC

Merlin chasing a blue jay

Blue jay in flight

Whole peanuts and other shelled food items are carried off in the beak to be dealt with at leisure.

Blue jay cracking nuts

Nest in the top of a little pine

Eggs, Collection Museum Wiesbaden

Fledgling in mid-June

Fledgling head

Cypraea albuginosa, museum specimens. Naturalis.

Desmognathus

Southern ringneck snake, Diadophis p. punctatus

The defensive display of a San Bernardino ring-necked snake

Southern ring-necked snake, D. p. punctatus

Ring-necked snake from Mount Diablo, California

Recently hatched ring-necked snake, Missouri Ozarks.

D. p. pulchellus, coralbelly ring-necked snake

Fossil dental plate of Diodon. Miocene of United States

Diodora elizabethae

Diodora saturnalis

Diodora patagonica

Diodora lineata

Dosinia coerulea

Dosinia

Dosinia exasperata

Dosinia lupinus lincta, the smooth artemis

Adult voicing cat-like sounds at Wildwood Preserve Metropark, Ohio, USA

Nest and egg in a cedar shrub four feet above the ground

Time-lapse video of a blooming echinopsis

Echinopsis chamaecereus at the Talcott Greenhouse.

Passenger pigeon

Earliest published illustration of the species (a male), Mark Catesby, 1731

Band-tailed pigeon, a species in the related genus Patagioenas

The physically similar mourning dove is not closely related.

Turnaround video of an adult male specimen at Naturalis Biodiversity Center

Turnaround video of an adult female specimen at Naturalis

Turnaround video of a juvenile female specimen at Naturalis

Skeleton of a male bird, 1914

Musical notes documenting male vocalizations, compiled by Wallace Craig, 1911

Specimen in flying pose, Academy of Natural Sciences of Drexel University

Live male in Whitman's aviary, 1896/98

Illustration of migrating flocks, Frank Bond, 1920

Juvenile (left), male (center), female (right), Louis Agassiz Fuertes, 1910

Alert parent bird posing defiantly towards the camera

Acorns in South Carolina, among the diet of this bird

Internal organs of Martha, the last individual: cr. denotes the crop, gz. the gizzard, 1915

Nesting captive bird, wary of the photographer

Nest and egg in Whitman's aviary

Preserved egg, Muséum de Toulouse

Live nestling or squab

Immature bird; the young were vulnerable to predators after leaving the nest

Billing pair by John James Audubon, from The Birds of America, 1827–1838. This image has been criticized for its scientific accuracy.

Painting of a male, K. Hayashi, c. 1900

Depiction of a shooting in northern Louisiana, Smith Bennett, 1875

1881 spread showing methods of trapping pigeons for shooting contests

Pigeon net in Canada, by James Pattison Cockburn, 1829

Trapper Albert Cooper with blind decoy pigeons for luring wild birds, c. 1870

Male and female by Louis Agassiz Fuertes, frontispiece of William Butts Mershon's 1907 The Passenger Pigeon

Life drawing by Charles R. Knight, 1903

"Buttons", the second last confirmed wild passenger pigeon, Cincinnati Zoo

Whitman's aviary with passenger pigeons and other species, 1896/98

Martha, the last passenger pigeon, alive in 1912

Martha at the Smithsonian Museum, 2015

Pigeons being shot to save crops in Iowa, 1867

Taxidermied male and female, Laval University Library

Closeup of head.

A close up portrait

Gravid female

Young corn snake

Baby corn snakes hatching from their eggs

Captive corn snake eating young mouse

A docile young corn snake (an introduced species) captured from the wild on the island of Nevis, West Indies, in 2009.

An anerythristic corn snake

Amelanistic Stripe corn snake

"Opal" phase corn snake

Exogyra

Exogyra.

Exilia

Epitonium hexagonum

Epitonium irregulare

Vocalizations of the Big brown bat vary with behavioral context

Big brown bats roost in a Minnesota barn

Fossil shell of Euspira catena from Pliocene of Italy

Eutrephoceras

Fossil Euthria from the Pliocene of Cyprus.

Eutrephoceras dorbignyanum

Eutrephoceras dekayi from the Coon Creek Formation

Exogyra costata, Prairie Bluff Chalk Formation ( Maastrichtian); Starkville, Mississippi

Adult female in Winnipeg, Manitoba, Canada

Kestrel relaxing in an apple tree.

Female about to pounce

A young bird

Male with handler, San Diego Zoo

Fissurella

Fissurella crassa

Fissurella latimarginata

Fissurella radiosa tixierae, apical view

Fissurella rubropicta

Fissurella virescens

Ancient Egyptian flabella (top center) and lotus motifs. 1868, NYPL picture collection

A 19th-century painting by Horace Vernet of Pope Pius VIII being carried on the sedia gestatoria and flanked by flabella.

Eastern Christian ripidion, 19th century ( Pskov museum).

Armenian silver ripidion, with six-winged seraphim.

Fossil of Galeodea tauroglobosa

Cazón en adobo

In flight

Juvenile swimming in the ocean off Mcgee Island, Maine

Swimming

Foraging

On a nest by water in Maine, U.S.

Egg

Adult with chicks

Cassell's book of birds, ca 1875

The underside of a human tongue, showing its rich blood supply.

Foramen cecum and terminal sulcus labelled above

Features of the tongue surface

Lateral view of the tongue, with extrinsic muscles highlighted

Coronal section of tongue, showing intrinsic muscles

Blood supply of the tongue

Section through the human tongue; stained H&E

Giraffe's tongue

Extended proboscis of a long tongued Macroglossum moth

Glycymeris

A variety of Goniopora sp.

A Mississippi map turtle swimming in a tank at a pet store.

Five sunning with a midland painted turtle, Ottawa, Ontario

Adult plastron

Basking on a sunny day

Adult and chick

Bald eagle anatomy

This eagle has a sizeable wingspan

Bald eagle in flight at Yellowstone National Park, Wyoming

Juvenile with salmon, Katmai National Park

With freshly caught fish in Kodiak

Head details

Feeding on catfish and other various fishes. Painted by John James Audubon

A bald eagle on a whale carcass.

At the Hawk Conservancy Trust in Andover

Mating

Egg, Collection at Museum Wiesbaden in Germany.

Chick at Everglades National Park

Newly fledged juvenile

First-year

Lady Baltimore, a bald eagle in Alaska who survived a poaching attempt, in her Juneau Raptor Center mew, on August 15, 2015

In Skagit Valley, Washington, United States

Staff at the National Eagle Repository processing a bald eagle

Seal of the President of the United States

Human left hand with hamulus of hamate bone shown in red

Numerous shells of a Turritella species washed up on the beach at Playa Grande, Costa Rica

Fossil specimens of Turritella incrassata

Eastern hognose snake

North Carolina specimen

Florida specimen

Cape Cod, Massachusetts specimen.

Western hog-nosed snake, H. nasicus

Bullhead shark egg case

Hexaplex

Barking tree frog, Hyla gratiosa

Hyla arborea

Metamorphs are often similar in appearance. H. gratiosa (left), H. cinerea (center), H. chrysoscelis (right)

Eggs

Metamorph

Hyla gratiosa males calling

Isognomon

Mole kingsnake (Lampropeltis calligaster rhombomaculata)

California kingsnake (Lampropeltis getula californiae)

Speckled king snake (Lampropeltis getula holbrooki)

A muon transmutes into a muon neutrino by emitting a
W⁻
boson. The
W⁻
boson subsequently decays into an electron and an electron antineutrino.

Left-handed and right-handed helicities

Lepton–photon interaction

Each generation forms a weak isospin doublet.

L. g. getula can be quite docile even when caught wild.

Milk snake

Juvenile Eastern milk snake

Young milk snake found in central Tennessee that had just eaten a lizard

Mexican milk snake, L. t. annulata

L. g. getula can be quite docile even when caught wild.

Milk snake

Juvenile Eastern milk snake

Young milk snake found in central Tennessee that had just eaten a lizard

Mexican milk snake, L. t. annulata

Eastern kingsnake (Lampropeltis getula getula)

Florida kingsnake in Dixie County, Florida.

Lynx

Eurasian lynx

Iberian lynx

Bobcat

A lynx stalking prey

Bobcat

Comparative illustration of bobcat (top) and Canada lynx (bottom) heads (1906)

A bobcat finds water

Bobcat in the front yard of a residence

Bobcats often prey on rabbits, hares, and rodents.

Bobcat kittens in June, about 2–4 months old

Bobcat tracks in mud showing the hind-paw print (top) partially covering the fore-paw print (center)

Skull of a bobcat

Bobcat confronting a pair of coyotes.

Bobcat in urban surroundings: The species' range does not seem to be limited by human populations, as long as it can still find a suitable habitat.

The bobcat population has seen decline in the American Midwest, but is generally stable and healthy.

A Shiva Lingam near the Radhe Krishna Temple in Rajbira

A 10th-century four-headed stone lingam ( Mukhalinga) from Nepal

Lingodbhava Shiva: God Shiva appears as in an infinite Linga fire-pillar, as Vishnu as Varaha tries to find the bottom of the Linga while Brahma tries to find its top. This infinite pillar conveys the infinite nature of Shiva.^[6]

Mural painting depicting Shiva with the Lingam in the Palace of Mehrangarh Fort, Jodhpur.

A lingam with a swastika at the Katas Raj Temples in northern Pakistan.

A birds eye view of a Shiva Lingam

Ancient Shiv Ling at Rajbari.jpg

Lingam in the cave at Amarnath

Lunularia can also reproduce sexually, as illustrated by Haeckel in this drawing of an archegonial head with ( diploid) sporophyte plantlets. The main plant body ( thallus) is haploid

L. orbiculatum on a rock fragment; rock length ~3 cm.

Lithophyllum sp.

Macoma secta, the white-sand macoma

Exhuming the First American Mastodon, 1806 painting by Charles Willson Peale

Comparison of woolly mammoth (L) and American mastodon (R)

Comparison of a woolly mammoth (left) and an American mastodon (right).

Excavation of a specimen in a golf course in Heath, Ohio, 1989

American mastodon molars at the State Museum of Pennsylvania

Female and calf American mastodon at the George Page Museum

Restoration of an American mastodon herd by Charles R. Knight

Tooth of M. africanavus, one of the earliest known species of mammoth, from North Africa.

Paleolithic painting of mammoth from the Rouffignac Cave

Restoration of a steppe mammoth

Size (blue) compared to a human and other mammoths

Lyuba, a mummified woolly mammoth calf, at the Field Museum of Natural History in Chicago

Mammuthus primigenius "Hebior Mammoth specimen" bearing tool/butcher marks

Model depicting the calf "Dima", Stuttgart

1863 lithograph of the partial holotype molar (specimen BMNH 40769)

One of the largest mounted mammoth skeletons in the world, nicknamed "Archie", at Nebraska State Museum of Natural History. It is the type specimen of the synonym Archidiskodon imperator maibeni

Excavation of a pygmy mammoth, which evolved from Columbian mammoths on the Channel Islands of California

Specimen formerly assigned to the synonym M. jeffersonii (also suggested to be a hybrid between Columbian and woolly mammoths) at the American Museum of Natural History

Underside of the skull of a male La Brea specimen nicknamed "Zed", showing upper molars

Outcrops on Goat Rock Beach, possibly used as rubbing rocks by Columbian mammoths

Restoration of a pair by a lake, Robert Bruce Horsfall, 1912

Female "mammoth W" specimen at the Waco Mammoth National Monument

Male "Murray" specimen at the Hot Springs Mammoth Site

Predators fighting over a Columbian mammoth carcass in the La Brea Tar Pits, Robert Bruce Horsfall, 1911

S. fatalis fighting dire wolves over a Columbian mammoth carcass in the La Brea Tar Pits, Robert Bruce Horsfall, 1913

Mandible showing lower molars, in a lahar deposit at the Paleontological Museum in Tocuila, Mexico

Cast of the old male "Huntington mammoth" (which had preserved stomach contents) at the Natural History Museum of Utah

Skeleton of a juvenile at the Natural History Museum of Utah

Environment around the La Brea Tar Pits, with Columbian mammoth herd in the background, Charles R. Knight, 1921

S. fatalis pair approaching a group of ground sloths ( Paramylodon), one mired, at the La Brea Tar Pits, Charles R. Knight, 1921

Fanciful restoration of a Columbian mammoth hunt, John Steeple Davis, 1885

Tracings of petroglyphs from Utah, depicting two Columbian mammoths; a bison carving is superimposed on one of the mammoth carvings

13,000 year old Clovis points

A margin snail with its mantle partly covering the shell

Marpesia from Promptuarii Iconum Insigniorum

"Flagellata" from Ernst Haeckel's Artforms of Nature, 1904

Parasitic excavate (Giardia lamblia)

Green algae ( Chlamydomonas)

"Flagellata" from Encyclopædia Britannica

Megalonyx jeffersonii skeleton cast produced and distributed by Triebold Paleontology Incorporated

Megalonyx jeffersonii skeleton

Melanella

Melanella martinii, abapertural view

Adult female – showing reddish belly.

Peeking out of its nest

A female red-bellied woodpecker feeding her chick

Red-bellied woodpecker feeding on the ground, Central Park, New York, USA.

Red-bellied woodpecker foraging behavior

Plate 1 of The Birds of America by John James Audubon, depicting a wild turkey

Male ocellated turkey, Meleagris ocellata

A roast turkey surrounded by Christmas log cake, gravy, sparkling juice, and vegetables

Closeup of wild turkey hen

Eastern subspecies

Wild turkey in flight

Hen with poults

Nest with 10 eggs

Hen with juveniles

Eastern wild turkey

Rio Grande wild turkey has relatively long legs

Gould's wild turkey

Female wild turkey with young, from Birds of America by John James Audubon

Eastern wild turkey (M. g. silvestris) hens

Mesalia

Defensive Position

Nahal Ayyun Bridge

Park near Nahal Ayyun

Safari Disaster Memorial site

Ice skating in the Canada Centre

Microtus skulls (Bailey, 1900)

Microtus skull bases (Bailey, 1900)

Side view

Juvenile in the open

On the ground amid strands of grass in Virginia, US

Murex altispira

Fossil shell of Murex spinicosta from Pliocene of Italy

Little brown bat with white-nose syndrome

Applying a wing band to help biologists and researchers identify individual bats from year to year.

Fossil tooth or plate of Myliobatis dixoni from Khouribga (Morocco), 55-45 mya

Archaeological museum Narona

Fossil Naticarius millepunctatus, Nicosia Formation, Pliocene, Cyprus.

Mare and foal at Ashfall Fossil Beds

A large pack rat midden (center) from the Pleistocene period

Active pack rat midden in northern Nevada

Bushy-tailed woodrat on midden

Nerodia rhombifer, diamondback water snake, giving birth

Nerodia erythrogaster transversa, blotched water snake

Nucula

Fawn waving its white tail

Male whitetail in Kansas

Seneca White Deer

O. v. truei, female, Costa Rica

Three O. v. borealis, New Hampshire

North America

Central and South America

White-tailed deer buck seen in Missoula, Montana.

Female with tail in alarm posture

Close up of female's head

Male white-tailed deer

White-tailed bucks with antlers still in velvet, August 2011

White-tailed deer during late winter

These bucks were pursuing a pair of does across the Loxahatchee River in Florida—the does lost them by entering a mangrove thicket too dense for the bucks' antlers.

Fawn lying on grass

Two white-tailed deer nuzzling in Cayuga Heights, New York

Rescued fawn being kept as a pet in a farm near Cumaral, Colombia

Three White-tailed deer spotted in Buena Vista, Virginia

Car that suffered major damage after striking a white-tailed deer in Wisconsin

Odocoileus virginianus skull, part of an exhibition on the cultural artifacts of the Cora people of Western Mexico.

The prominent cusps of one Odontaspis species (O. ferox).

Odostomia fusulus Monterosato, 1878

Buddhist monastery in Olivella

O. aestivus, rough green snake

O. aestivus climbing over vegetation

Illustration of the owl by Audubon

Screech owls can easily avoid detection during the day due to their effective camouflage among the bark of deciduous trees.

Juvenile eastern screech owl

Fuertes portrait of a red and gray morph screech owl

Fossil valves of Ostrea forskali from Pliocene of Italy

A lingual (tongue-side) view of a lateral O. obliquus.

Illustration of articulated vertebrae of P. toliapicus

Two cladograms proposed for Panthera. The upper one is based on phylogenetic studies by Johnson et al. (2006),^[7] and by Werdelin et al. (2010).^[8] The lower cladogram is based on a study by Davis et al. (2010)^[9] and by Mazák et al. (2011).^[10]

A male jaguar photographed near Rio Negro, Brazil

Fossil skull of Pleistocene North American jaguar (Panthera onca augusta)

The head of the jaguar is robust and the jaw extremely powerful. The size of jaguars tends to increase the farther south they are located.

A melanistic jaguar is a color morph which occurs at about 6 percent frequency in populations.

The jaguar inhabits a variety of forested and open habitat, but is strongly associated with the presence of water.

Mother about to pick up a cub by the neck

4-months-old cub at the Salzburg Zoo

Jaguars at Cameron Park Zoo in Waco, Texas

The jaguar has an exceptionally powerful bite that allows it to pierce the shells of armored prey.

Illustration of a jaguar killing a tapir, the largest native land animal in its range

Jaguar killed by Theodore Roosevelt

A melanistic jaguar

Adult jaguar in Cameron Park Zoo, Waco, Texas

El Jefe

Moche jaguar figurine (300 AD), Larco Museum Lima, Peru

Jaguar warrior in the Aztec culture

Statuette Karajà

Copy of the Book of Chilam Balam of Ixil in the National Museum of Anthropology, Mexico

The Three Graces, by Antonio Canova ( Hermitage, St. Petersburg)

Skull diagram

Fisher in winter coat

A fisher in the woods near Ipswich, Massachusetts

A fisher climbing a tree at night

Fisher pelts sold: 1920–1984^[11]^[12]

Fisher fur pelt (dyed)

Fisher raiding a farmer's duck coop

Male fisher killed by anticoagulant rodenticide on a marijuana grow site on US Forest Service Lands, southern Sierra Nevada mountains

Penion

An embedded fossil of Penion crawfordi from Cape Palliser, New Zealand.

Young bird

Eurasian magpie egg

Hopscotch game with the magpie rhyme

Maghreb magpie (P. p. mauritanica) showing the characteristic blue patch behind the eye

In flight

P. p. bactriana in Ladakh

Female of the Great Basin race, orius, which has less white on the wings than eastern races and has cream-colored underparts

Male moulting to his duller feathers during autumn

Scarlet tanagers eat ripe fruit when available, occasionally including ones, such as this orange half, that are set out by humans

Call of the Scarlet Tanager

Stuffed Scarlet tanager from 1860's, St. Barthélemy

A northern slimy salamander in Great Smoky Mountains National Park, Tennessee

Young chick swimming on Lake Washington

P. podiceps eggs at Bogotá's Simón Bolívar Park

Adult with two juveniles feeding on a crawfish

Polinices

Polinices galianor umbilicus; Pliocene of San Diego County, California.

Porella

Potamides

Pseudemys

Common grackle

Iridescent male common grackle

Common grackle (Quiscalus quiscula) in Central Park, New York, USA.

Jai Singh I of Amber receiving Shivaji a day before concluding the Treaty of Purandar (12 June 1665)

The Maharaja of Benares and his suite, 1870s

A Chinese depiction of a Raha (the Spanish pronunciation of Rajah) or Hari in Boxer Codex (c. 1595). Raja was a title used by the Royalties in the Classical Period of pre-colonial Philippines.

Raja Dhrub Dev assesses a horse, by Nainsukh, c. 1740s; it was usual for horses to be shown off in front of a white sheet, to better appreciate their form

Rana (genus)

American bullfrog

In typical aquatic habitat

A young male displaying yellow throat and large tympani

Bullfrog larva and mouthparts

Juvenile with a small, grey, oval-shaped area on top of the head, the parietal eye

Alligator feeding on a bullfrog

Bullfrogs in a Chinese supermarket

American bullfrog caught at night by a pond in the Southern United States on a homemade frog gig

Young northern leopard frog

Two burnsi morphs, a green morph, and a brown morph of the northern leopard frog

Near Welland Canal, Ontario

Reindeer losing the velvet layer under which a new antler is growing, an annual process

Skull

Caribou licking salt from roadway in British Columbia

Swedish reindeer

The size of the antlers plays a significant role in establishing the hierarchy in the group.^[13]

Swedish reindeer walking

Reindeer standing on snow to avoid blood-sucking insects.

Approximate range of caribou subspecies in North America. Overlap is possible for contiguous range. 1.R. t. caribou subdivided into ecotypes: woodland (boreal), woodland (migratory), woodland (montane), 2.R. t. dawsoni extinct 1907, 3. R. t. granti, 4.R. t. groenlandicus, 5. R. t. groenlandicus/pearyi 6. R. t. pearyi

Male Porcupine caribou R. t. granti in Alaska

The Beverly herd of barren-ground caribou, Thelon River, Nunavut.^[14]

The Peary caribou is a relatively small and pale subspecies found in the tundra of far northern North America. Unsurprisingly, it is part of the group known as tundra reindeer.

Characteristically small and relatively short-legged reindeer from Svalbard

Svalbard reindeer (R. t. platyrhynchus)

Southernmost reindeer: South Georgian reindeer with velvet-covered antlers

Reindeer pulling a sled in Russia

Early 20th Century Inuit parka from caribou skin

A reindeer sled, Arkhangelsk, Russia. Late nineteenth-century photochrom

Milking reindeer in the 19th century

Tragelaphus or deer-goat

Two Scottish reindeer relax after pulling Santa's sleigh at the switching on of Christmas lights

Rhinobatos hakelensis fossil

Fossil of Rhinobatos whitfieldi

Fossil of Rhinobatos hakelensis

The town

American woodcock

Fossil of Scyliorhinus elongatus from Cretaceous of Lebanon

A shell of Seila marmorata

"Woodcock, with attenuate primaries, nat. size." 1891.

Downy young are already well-camouflaged

Jupiter and Semele (1894-95), by Gustave Moreau

Drawing from an Etruscan mirror: Semele embracing her son Dionysus, with Apollo looking on and a satyr playing an aulos

Roman sarcophagus (ca. 190 CE) depicting the triumphal procession of Bacchus as he returns from India, with scenes of his birth in the smaller top panels ( Walters Art Museum, Baltimore, Maryland)

Jove and Semele (1695) by Sebastiano Ricci

Chlorocruorin

Shells of Sinum grayi

A shell of Sinum haliotoideum

Skena River

S. populator skull and syntype canine from Lund's collection, Zoological Museum, Copenhagen

1869 lithograph of the holotype molar and maxilla fragment of S. fatalis

Isolated S. populator canine tooth; the tip points to the right

La Brea S. fatalis skull cast with jaws at maximum gape

Lion pride attacking an African buffalo in Tanzania; Smilodon may also have hunted in groups

Undersides of S. fatalis skulls, showing canine replacement, George C. Page Museum

Maximum gape (A) and reconstructions of neck bite in prey of different sizes (B, C)

1880 skeletal diagram of S. populator

Barracuda

Woman carrying a barracuda in Madagascar

Scuba diver swimming inside a group of Sphyraena putnamae off Ko Tao, Thailand.

Close-up of Sphyraena barracuda

Sphyraena barracuda, with prey

School of Sphyraena qenie, at Elphinstone Reef in the Red Sea

A battery of Sphyraena putnamae, in Bora Bora

A battery of Sphyraena flavicauda off Dayang, Malaysia

Sphyraena borealis

Skull

Fur skin of Spilogale putorius

Fossil valve of Spondylus crassicosta from the Pliocene of Italy

Pacific thorny oyster, S. crassisquama Lamark, 1819, from the Gulf of California, Mexico

The interior of two fossil valves of Spondylus from the Pliocene of Cyprus

Cat's tongue oyster, Spondylus linguaefelis Sowerby, 1847, from Hawaii

A view of the colorful mantle edges of a live thorny oyster from East Timor: The eyes can be seen on the fringe between the mantle and the shell.

A fossil Spondylus gaederopus from the Pliocene of Cyprus

North American brown snake

A brown snake in Clarksville, Tennessee

Close-up, Ontario, Canada

Gatineau Park, Gatineau, Quebec

Barred pattern, Ontario, Canada

Barred Owl song, recorded in Florida, USA

Live animal of the Florida fighting conch Strombus alatus. Note the extensible snout in the foreground, and the two stalked eyes behind it

Fossil shell of Strombus radix

Fossil shell of Strombus coronatus from Pliocene of Italy

Pleistocene fossil

(video) A tapir at Ueno Zoo.

Tapir showing the flehmen response

Baird's tapir

A mountain tapir, the wooliest and most threatened species of tapir

Lowland tapir earthenware from Suriname, made before 1914

T. proterum and Barbourofelis loveorum

Terebra maculata shell

Terebra inversa, a fossil gastropod from Pliocene deposits near Antwerp.

Posterior tooth of a garter snake

Close up of the scales on the back of the common garter snake.

Eating a frog

Mating ball

Young garter snake

Common garter snake ( Thamnophis sirtalis sirtalis)

Eastern blackneck garter ( Thamnophis cyrtopsis ocellatus)

Checkered garter snake (Thamnophis marcianus)

Eastern Plains garter snake (T. radix radix), a disputed subspecies of Thamnophis radix

Redstripe ribbon snake (T. proximus rubrilineatus)

Texas garter snake ( Thamnophis sirtalis annectens)

Tetrodotoxin effects in garter snakes

Effects of temperature in the common garter snake

Thiara winteri, abapertural view

A red variety of Trachyphyllia in a reef aquarium

Comparisons of "trapezium" in both British and American English.

Fossil teeth of T. oshoshunensis from Khouribga (Morocco.)

Trinacria as depicted on flag of Sicily

Hindu priest blowing a trumpet made out of a large shell of Turbinella pyrum, in Tirupati, India

Cut-away view of an air foil bearing-supported turbocharger

On the left, the brass oil drain connection. On the right are the braided oil supply line and water coolant line connections.

Compressor impeller side with the cover removed.

Turbine side housing removed.

Garrett variable-geometry turbocharger on DV6TED4 engine

Illustration of typical component layout in a production turbocharged gasoline engine.

Illustration of inter-cooler location.

A recirculating type anti-surge valve

A free floating turbocharger is used in the 100 litre engine of this Caterpillar mining vehicle.

A medium-sized six-cylinder marine diesel-engine, with turbocharger and exhaust in the foreground

Redwing (Turdus iliacus) in Iceland

Male sings

Juvenile

Male

Female

Male with a worm

Perching on tree

Robin with nest-making materials

Tetrao cupido drawn by T. W. Wood for second edition of Darwin's The Descent of Man, 1874

Coat of arms during the sede vacante – featuring an umbraculum

Umbraculum in the Basilica of Saint Stanislaus Kostka in Winona, Minnesota

Detail of head – taken at the Cincinnati Zoo and Botanical Garden.

Cinnamon-colored black bear eating dandelions in Waterton Lakes National Park

Black bear at Grand Teton National Park

American black bears can be distinguished from brown bears by their smaller size, their less concave skull profiles, their shorter claws and the lack of a shoulder hump.

Some specimens may develop a white " crescent moon" mark on the chest. This white mark, which is constant in Asian black bears, occurs in only 25% of American black bears.^[15]