DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Whooper swan (Cygnus cygnus) resting. Whooper swans inhabit northern regions of the world around water. They spend the summer in the far north, and travel to more temperate regions in the winter. They eat aquatic plants and small invertebrates, and occasionally small fish and mammals. They take their name from their high, whooping call. Photographed on Hokkaido, Japan.
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