Staffan Widstrand / Black tern (Chlidonias nigra) flying in to feed its chick on tfloating vegetation in the Nemunas Delta Nature Reserve, Lithuania.
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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.
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Roger Powell / Two Whiskered terns (Chlidonias hybridus) fighting over perch, Le Cherine Nature Reserve, La Brenne, France. April.
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Roger Powell / Two Whiskered terns (Chlidonias hybridus) fighting over perch, Le Cherine Nature Reserve, La Brenne, France. April.
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Roger Powell / Two Whiskered terns (Chlidonias hybridus) fighting over perch, Le Cherine Nature Reserve, La Brenne, France. April.
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Roger Powell / Two Whiskered terns (Chlidonias hybridus) disputing a perch on top of a post in a lake. Le Cherine Nature Reserve, La Brenne, France.
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Tony Wu / Eden's whale (Balaenoptera edeni edeni) named Mae Gunya and her calf Jao Khamsamut feeding on anchovies in the shallow waters of the upper Gulf of Thailand. Around them are whiskered terns (Chlidonias...
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Markus Varesvuo / Juvenile Black tern (Chlidonias niger) in flight, Hungary, July.
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Markus Varesvuo / Black tern (Chlidonias niger) in flight, Hungary, July.
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Markus Varesvuo / White-winged black tern (Chlidonias leucopterus), Israel, May.
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Markus Varesvuo / White-winged black tern (Chlidonias leucopterus), Israel, May.
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Markus Varesvuo / White-winged black tern (Chlidonias leucopterus), Israel, May.
