ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Arctic terns (Sterna paradisaea) in flight. These migratory sea-birds are native to Arctic Europe, Asia and America. Their wingspan measures up to 85 centimetres and they can weigh up to 127 grams. Photographed in Madagascar, in July, during their migration.
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