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.
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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) drinking, Israel, May.
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Markus Varesvuo / Mixed flock of Whiskered terns (Chlidonias hybridus) and White-winged black terns (Chlidonias leucopterus), Hungary, March.
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Roger Powell / Ruff (Philomachus pugnax) male "levitating" display to attract the attention of a Reeve (female) out on the marsh, with Arctic Terns (Sterna paradisaea) alongside, Varanger plateau, Arctic Norway. Jun...
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Nick Upton / White-winged black tern (Chlidonias leucopterus) in flight, Biebrza marsh, Poland.
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David Pattyn / Two Whiskered terns (Chlidonias hybrida) fighting over nesting material close to nest among Water soldier (Stratiotes aloides) plants, Danube delta, Romania. July.
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David Pattyn / Dalmatian pelican (Pelecanus crispus) swimming among Water soldier (Stratiotes aloides) plants being attacked by flock of Whiskered terns (Chlidonias hybrida), Danube delta, Romania. July.
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Hermann Brehm / Three Whiskered terns (Chlidonias hybrida) mobbing Grey heron (Ardea cinerea) which is crossing breeding colony. Hungary. July.
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John Chan / Elegant terns (Thalasseus elegans) diving and streaking which triggers the flock to take flight in unison, an example of flocking behavior, Bolsa Chica Ecological Reserve, Southern California, USA Mar...
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John Chan / Elegant terns (Thalasseus elegans) gathering at mussel bed during breeding season, one hovering tern has a mussel clamped to its foot, a common mishap caused by stepping on an open mussel, Bolsa Chica...
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John Chan / Elegant terns (Thalasseus elegans) gathering at breeding grounds take flight and return in unison, an example of flocking behavior, Bolsa Chica Ecological Reserve, Southern California, USA, March.
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John Chan / Elegant terns (Thalasseus elegans) gathered at breeding grounds taking flight in unison, an example of flocking behavior, Bolsa Chica Ecological Reserve, Southern California, USA, March.
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John Chan / Elegant terns (Thalasseus elegans) gathering at breeding grounds take flight in unison, an example of flocking behavior, Bolsa Chica Ecological Reserve, Southern California, USA, March.
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John Chan / Brown pelicans (Pelecanus occidentalis) gathering with Western gull (Larus occidentalis), Elegant terns (Thalasseus elegans), Snowy egrets (Egretta thula) , Great egrets (Ardea alba) and Great blue he...
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John Chan / Snowy egrets (Egretta thula) stalking as Elegant terns (Thalasseus elegans) dive nearby during a feeding frenzy, Bolsa Chica Ecological Reserve, Southern California, USA, September.
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John Chan / Brown pelicans (Pelecanus occidentalis) flock taking flight with Elegant terns (Thalasseus elegans) and Double-crested cormorants (Phalacrocorax auritus), during a feeding frenzy, Bolsa Chica Ecologic...
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John Chan / Brown pelicans (Pelecanus occidentalis) gathered with Western gulls (Larus occidentalis), Elegant terns (Thalasseus elegans) and Double-crested cormorants (Phalacrocorax auritus) during a feeding fren...
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John Chan / Forster's terns (Sterna forsteri) diving for fish, Bolsa Chica Ecological Reserve, Southern California, USA, August.
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Roger Powell / Ebro Delta marisma / marsh habitat for breeding colonies of gulls, terns and waders. Ebro Delta, Catalonia, Spain, April 2019.
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David Woodfall / Viking style building made for filming the TV Series 'The Vikings' built in Kilcoole Marsh , habitat for Little terns (Sterna albifrons) Republic of Ireland, June.
