Marie Read / Canada geese (Branta canadensis) two during territorial fight in early spring, Ithaca. New York, USA

Richard Steel / 2020VISION / Grasshopper warbler (Locustella naevia) singing, Wirral, England, UK, May 2012

Marie Read / Red-winged blackbird (Agelaius phoeniceus) male calling and displaying, backlit, showing steamy breath on a chilly spring morning, Ithaca, New York, USA, April.

Marie Read / Black terns (Chlidonias niger), pair on a perch, vocalizing during courtship (termed 'Erect Posture' display), Montezuma National Wildlife Refuge, New York, USA, May.

Marie Read / Ovenbird (Seiurus aurocapilla), male singing in spring, New York, USA

Marie Read / Ovenbird (Seiurus aurocapilla), male singing in spring, New York, USA

Gerrit Vyn / Great knot (Calidris tenuirostris) giving alarm laugh vocalization on the breeding grounds. Chukotka, Russia. May.

Gerrit Vyn / Pair of Pied-billed Grebes (Podilymbus podiceps) in breeding plumage. Birds are performing the "greeting duet" vocalization. Notice the much smaller size of the female. King County, Washington, USA, A...

Gerrit Vyn / Great Grey Owl (Strix nebulosa) juvenile perched in Poplar tree, emitting begging vocalization. Young great grays utter this call steadily throughout the day and night to solicit their parents to feed...

Gerrit Vyn / Common Loon (Gavia immer) head portrait of male on water, in breeding plumage giving yodel call. The yodel call is a complex territorial vocalization only given by males and is individual specific. Is...

Gerrit Vyn / Common Loon (Gavia immer) male on water, in breeding plumage giving yodel call. The yodel call is a complex territorial vocalization only given by males and is individual specific. Island County, Wash...

Gerrit Vyn / Adult male Semipalmated Sandpiper (Calidris pusilla) vocalizing from a piece of driftwood. Bird is giving the "motorboat" vocalization. Seward Peninsula, Alaska, USA, June.