Flight call

From Wikipedia
https://en.wikipedia.org/wiki/Flight_call

Flight calls are vocalisations made by birds in flight, often serving to keep flocks together. [1]

References

  1. ^ Cech, Rick; Dunning, John B. Jr.; Elphick, Chris (2001). "Behavior". In Elphick, Chris; Dunning, John B. Jr.; Sibley, David Allen (eds.). The Sibley Guide to Bird Life and Behavior. New York: Alfred A. Knopf. pp. 68–69. ISBN  978-1-4000-4386-6.