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Black terns (Chlidonias niger), pair on a perch, vocalizing during courtship (termed Erect Posture display), Montezuma National Wildlife Refuge, New York, USA, May
Black tern (Chlidonias niger) hunting over water in prairie wetland for emerging midges (Chironomidae) Medicine Lake National Wildlife Refuge, Montana, USA. June
Whiskered tern (Chlidonias hybridus), Hungary, June
