Flock of knot on ground
Flock of knot (Calidris canutus) on the ground. This stocky shorebird is commonly spotted feeding in estuaries around the coast. Knots are highly migratory birds that breed in the high Arctic and winter in coastal areas of Europe, Africa, and South America. They can travel up to 15,000 kilometres, stopping along the way at least once to feed on invertebrates, molluscs and crustaceans buried in the mud., by DR P. MARAZZI/SCIENCE PHOTO LIBRARY
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