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Elegant tern (Thalasseus elegans) in flight, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant terns (Thalasseus elegans) in courtship display on Isla Rasa, Baja California, Mexico, North America

Elegant tern (Thalasseus elegans) and Heermann's gull (Larus heermanni) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Terns being fed by local guide with back tattoo in the shallow waters of Stingray City, Moorea, Society Islands, French Polynesia, South Pacific, Pacific

Adult arctic tern (Sterna paradisaea) returning to chick with small fish, Flatey Island, Iceland, Polar Regions

Adult white tern (Gygis alba) with squid in its beak, Lord Howe Island, UNESCO World Heritage Site, New South Wales, Australia, Pacific

Elegant tern (Thalasseus elegans) and Heermann's gull (Larus heermanni) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant tern (Thalasseus elegans) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant tern (Thalasseus elegans) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant terns (Thalasseus elegans) in flight at breeding colony on Isla Rasa, Baja California, Mexico, North America

Arctic tern (Sterna paradisaea)perched on a rock on the Farne Islands, Northumberland, England, United Kingdom, Europe

Adult arctic tern (Sterna paradisaea) returning to chick with small fish, Flatey Island, Iceland, Polar Regions

Elegant terns (Thalasseus elegans), at breeding colony on Isla Rasa, Baja California, Mexico, North America

Elegant tern (Thalasseus elegans) in flight, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

South American terns (Sterna hirundinacea) near Rio Deseado, Puerto Deseado, Santa Cruz, Patagonia, Argentina, South America

Elegant terns (Thalasseus elegans) mating, Isla Rasa, Gulf of alifornia (Sea of Cortez), Baja California, Mexico, North America

Elegant tern (Thalasseus elegans) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant tern (Thalasseus elegans) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant tern (Thalasseus elegans) with fish, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Adult Arctic terns (Sterna paradisaea), returning to the nest with fish, Vigur Island, Iceland, Polar Regions

Adult white tern (Gygis alba), at the Belvedere on Makatea, French Polynesia, South Pacific, Pacific

Elegant tern (Thalasseus elegans) breeding colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant terns (Thalasseus elegans) in flight at breeding colony on Isla Rasa, Baja California, Mexico, North America

Terns and seagulls on Capitola Beach, Capitola City, Santa Cruz County, California, United States of America, North America

Adult arctic tern (Sterna paradisaea) returning to chick with small fish, Flatey Island, Iceland, Polar Regions

Elegant tern (Thalasseus elegans) colony, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant terns (Thalasseus elegans), Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant terns (Thalasseus elegans) mating, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant terns (Thalasseus elegans), Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Adult white tern (Gygis alba) with fish in its bill in Toarava, Fakarava, French Polynesia, South Pacific, Pacific

Royal tern birds on beach, Sanibel Island, Gulf Coast, Florida, United States of America, North America

Elegant terns (Thalasseus elegans), Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Elegant terns (Thalasseus elegans), Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

South American terns (Sterna hirundinacea) near Rio Deseado, Puerto Deseado, Santa Cruz, Patagonia, Argentina, South America

Elegant tern (Thalasseus elegans, Isla Rasa, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Terns on Capitola Beach, Capitola City, Santa Cruz County, California, United States of America, North America

Terns on Capitola Beach, Capitola City, Santa Cruz County, California, United States of America, North America

Arctic tern in flight, Sterba paradisaea, Isle of May breeding colony, Fife, Scotland, United Kingdom, Europe

Antarctic tern (Sterna vittata), feeding in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

Antarctic tern (Sterna vittata), on the wreck of the Guvernoren in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

Antarctic tern (Sterna vittata), on the wreck of the Guvernoren in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

Adult Antarctic tern (Sterna vittata) resting on ship's rail near Tristan da Cunha, South Atlantic Ocean

Juvenile Antarctic tern (Sterna vittata) resting on ship's rail near Tristan da Cunha, South Atlantic Ocean

Juvenile Antarctic tern (Sterna vittata) resting on ship's rail near Tristan da Cunha, South Atlantic Ocean

Adult Antarctic tern (Sterna vittata) resting on the National Geographic Explorer near Tristan da Cunha, South Atlantic Ocean

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Adult elegant tern (Thalasseus elegans), plunge diving for fish on Isla Carmen, Baja California Sur, Sea of Cortez, Mexico, North America

Arctic tern (Sterna paradisaea) in flight, Farne Islands, Northumberland coast, England, United Kingdom, Europe

Common Terns (Sterna hirundo), in their breeding colony in June, on Brownsea Island, a nature reserve in Poole Harbour, Dorset, England, United Kingdom, Europe

Common Terns (Sterna hirundo), in their breeding colony in June, on Brownsea Island, a nature reserve in Poole Harbour, Dorset, England, United Kingdom, Europe

Sandwich Terns (Sterna sandivicensis), in their breeding colony in June, on Brownsea Island, a nature reserve in Poole Harbour, Dorset, England, United Kingdom, Europe

Sandwich Terns (Sterna sandivicensis), in their breeding colony in June, on Brownsea Island, a nature reserve in Poole Harbour, Dorset, England, United Kingdom, Europe

Adult arctic tern (Sterna paradisaea) male bringing female a fish, Spitsbergen Island in the Svalbard Archipelago, Norway.

Adult arctic tern (Sterna paradisaea) male bringing female a fish, Spitsbergen Island in the Svalbard Archipelago, Norway.

Adult great skua (Stercorarius skua) being harassed by Arctic terns (Sterna paradisaea) guarding their nest sites in Svalbard.

Antarctic tern (Sterna vittata), on the wreck of the Guvernoren in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Caspian Tern (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Adult Royal Tern (Thalasseus maximus albididorsalis) in flight at breeding colony on Ile des Oiseaux, Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Adult elegant tern (Thalasseus elegans), looking for fish on Isla Carmen, Baja California Sur, Sea of Cortez, Mexico, North America

Antarctic tern (Sterna vittata) in brash ice near the Antarctic Peninsula, Antarctica, Southern Ocean, Polar Regions

Adult arctic tern (Sterna paradisaea) feeding on small fish on Spitsbergen Island in the Svalbard Archipelago, Norway, Arctic, Europe

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Antarctic tern (Sterna vittata) in brash ice near the Antarctic Peninsula, Antarctica, Southern Ocean, Polar Regions

Arctic tern (Sterna paradisaea) with sandeel, Inner Farne, Northumberland, England, United Kingdom, Europe

Adult elegant tern (Thalasseus elegans), looking for fish on Isla Carmen, Baja California Sur, Sea of Cortez, Mexico, North America

Adult elegant terns (Thalasseus elegans), at breeding colony on Isla Rasa, Baja California, Sea of Cortez, Mexico, North America

Adult elegant tern (Thalasseus elegans), looking for fish on Isla Carmen, Baja California Sur, Sea of Cortez, Mexico, North America

Arctic tern (Sterna paradisaea), in flight, Farne Islands, Northumberland, England, United Kingdom, Europe

The inner lagoon on Isla Rasa, an important nesting site for terns and gulls, Baja California, Sea of Cortez, Mexico, North America

Breeding elegant terns (Thalasseus elegans) return to colony on Isla Rasa, Baja California Norte, Mexico, North America

Adult elegant tern (Thalasseus elegans), looking for fish on Isla Carmen, Baja California Sur, Sea of Cortez, Mexico, North America

Antarctic tern (Sterna vittata) resting on an old wooden pier, Grytviken, South Georgia, Polar Regions