Bence Mate / Caspian gulls (Larus cachinnans) juveniles fighting, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. March.
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David Kjaer / Yellow-legged Gull (Larus cachinnans) & two Juvenile Herring Gull (Larus argentatus) catching fish and fighting, Poland
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Hanne & Jens Eriksen / Caspian tern (Hydroprogne caspia) with open beak, in shallow water. Oman, March.
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John Chan / Caspian tern (Hydroprogne caspia) plunge diving near a group of Elegant terns (Thalasseus elegans) gathering at breeding grounds, Southern California, USA, March.
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Loic Poidevin / Caspian gull (Larus cachinnans) perched on tree stump eating fish caught by Sea eagle. Black Sea, Danube Delta, Romania. May.
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Sylvain Cordier / Caspian gull (Larus cachinnans) in flight, Socotra Island UNESCO World Heritage Site, Yemen.
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Jussi Murtosaari / Caspian tern (Hydroprogne caspia) with fish prey, Finland, April.
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Andy Trowbridge / Caspian Tern (Sterna caspia) in flight. Lake Forsyth, Banks Peninsula, Canterbury, New Zealand. August.
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Andy Trowbridge / Caspian Tern (Sterna caspia) in flight. Ashley River, Canterbury, New Zealand. August.
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Martin Gabriel / Hundreds of Heuglin's gulls (Larus heuglini) and Caspian gulls (Larus cachinnans) sourround fishermen as they land their catch, Salalah, Sultanate of Oman, February.
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Hanne & Jens Eriksen / Caspian tern (Hydroprogne caspia) in flight looking for food, Oman, August
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Hanne & Jens Eriksen / Caspian tern (Hydroprogne caspia) in flight with fish, Oman, November
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Claudio Contreras / Caspian tern (Sterna caspia) in flight, El Vizcaino Biosphere Reserve, Baja Califonia Peninsula, Mexico, May
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Avi Meir / Caspian Gull (Larus cachinnans) taking flight, Eilat, Israel
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Hanne & Jens Eriksen / Caspian tern (Hydroprogne caspia) juvenile calling for food from adult, Oman, February.
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Mike Wilkes / Caspian tern (Sterna caspia) catching fish, Tanji Beach, Gambia, West Africa.
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Mike Wilkes / Caspian terns (Sterna caspia) resting on beach, Tanji Beach, Gambia, West Africa.
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Mike Wilkes / Caspian tern (Sterna caspia) catching fish, Tanji Beach, Gambia, West Africa.
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Mike Wilkes / Caspian tern (Sterna caspia) feeding on fish, Tanji Beach, Gambia, West Africa.
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Mike Wilkes / Caspian tern (Sterna caspia) flying over beach, Tanji Beach, Gambia, West Africa.
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Hanne & Jens Eriksen / Caspian tern (Sterna caspia) in flight, Oman, January
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Wild Wonders of Europe / Lundgren / Caspian gull (Larus cachinnans) and White pelican (Pelecanus onocrotalus) perched, waiting for nearby fisherman to empty his nets, Danube Delta, Romania, June.
Ralph Martin / Caspian Gull (Larus cachinnans), Baden-Wurttemberg, Germany
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Juan Manuel Borrero / Illustration of seagulls. Caspian Gull (Larus cachinans), Audouinas Gull (Larus audouinii), Common Black-headed Gull (Chroicocephalus ridibundus). Pencil, watercolor and pastel illustration
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Grzegorz Lesniewski / Yellow Legged Gull/Caspian Gull (Larus cachinnans) nest with eggs. Vistual River, Mazovia, Poland, May.
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Grzegorz Lesniewski / Yellow Legged Gull/Caspian Gull (Larus cachinnans) chicks in nest. Vistual River, Mazovia, Poland, May.
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Grzegorz Lesniewski / Yellow Legged Gull/Caspian Gull (Larus cachinnans) chick hatching. Vistual River, Mazovia, Poland, May.
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Pete Oxford / Caspian Gull (Larus cachinnans) profile, Gibraltar, United Kingdom
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Nick Upton / Juvenile Yellow legged gulls (Larus cachinnans) chasing Sardine / European pilchard (Sardina pilchardus) as it leaps out of sea in attempt to escape. Between Isle of Lesbos /Lesvos, Greece and Turkey....
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Nick Upton / Yellow legged gull (Larus cachinnans) in flight between Isle of Lesbos / Lesvos, Greece and Turkey. August
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Nick Upton / Juvenile Yellow legged gull (Larus cachinnans) in flight at sunset, between Isle of Lesbos / Lesvos, Greece and Turkey. August
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Nick Upton / Yellow legged gull (Larus cachinnans) flying low over sea while fishing for Sardines / European pilchards (Sardina pilchardus) between Isle of Lesbos, Greece and Turkey. August
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Nick Upton / Yellow legged gull (Larus cachinnans) in flight between Isle of Lesbos /Lesvos, Greece and Turkey. August
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Nick Upton / Yellow legged gull (Larus cachinnans) in flight, between Isle of Lesbos /Lesvos, Greece and Turkey. August
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Nick Upton / Yellow legged gull (Larus cachinnans) chasing Sardine / European pilchard (Sardina pilchardus) leaping out of sea in attempt to escape. Between Isle of Lesbos / Lesvos, Greece and Turkey. August
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DAVID TIPLING / Flock of Yellow legged gulls (Larus cachinnans) flying over rough sea, Black Sea, Bulgaria
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DAVID TIPLING / Yellow legged Gull {Larus cachinnans} in flight, Lake Kerkini, Greece.
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DAVID TIPLING / Yellow legged Gull {Larus cachinnans} in flight, Lake Kerkini, Greece.
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Robin Chittenden / Caspian gull (Larus cachinnans) in flight, Dobrogea, Tulcea, Danube Delta Romania, September.
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Konstantin Mikhailov / Yellow legged gull (Caspian gull) {Larus cachinnans} Black sea
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Robin Chittenden / Caspian tern (Sterna caspia) in flight. Hickling Broad NWT, Norfolk, UK. May.
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Andy Trowbridge / Caspian Tern (Sterna caspia) in flight, diving for prey. Lake Ellesmere, Canterbury, South Island, New Zealand.
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Robin Chittenden / Caspian gull (Larus cachinnans) resting on beach outskirts, Norfolk, UK. October.
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Angelo Gandolfi / DELETE Yellow-legged gulls (Larus cachinnans) patrol the storm waves in search of food at Camogli village, Liguria, Italy. Composite image.
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Jussi Murtosaari / Caspian tern (Hydroprogne caspia) in flight. Kikkosalmi, Finland. May.
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Marie Read / Caspian terns (Sterna caspia), aggressive interaction between adult (facing viewer) and juvenile, Cayuga Lake, Ithaca, New York, USA, August.
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Marie Read / Caspian terns (Sterna caspia), juvenile (left) begging from adult in late summer, Cayuga Lake, Ithaca, New York, USA, August.
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Marie Read / Caspian terns (Sterna caspia), adult arrives with fish to feed begging juvenile, late summer, Cayuga Lake, Ithaca, New York, USA, August.
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Bernard Castelein / Caspian tern (Sterna caspia) flying with shell in beak, probably a juvenile play fishing objects from water surface. Allahein River, Gambia.
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Bernard Castelein / Caspian tern (Sterna caspia) flying over water. Allahein River, Gambia.
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Bernard Castelein / Caspian tern (Sterna caspia) stretching wings before taking off. Allahein River, Gambia.
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Jussi Murtosaari / Caspian gull (Larus cachinnans), juvenile in flight, Finland, August.