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The osprey (Pandion haliaetus), also called the western osprey, sea hawk, river hawk, and fish hawk, is a diurnal, fish-eating bird of prey with a cosmopolitan range. It is a large raptor, reaching more than 60 cm (24 in) in length and 180 cm (71 in) across the wings. It is brown on the upper parts and predominantly grayish on the head and underparts.

The osprey tolerates a wide variety of habitats, nesting in any location near a body of water providing an adequate food supply. It is found on all continents except Antarctica, although in South America it occurs only as a non-breeding migrant.

As its other common names suggest, the osprey's diet consists almost exclusively of fish. It possesses specialized physical characteristics and exhibits unique behaviour to assist in hunting and catching prey. As a result of these unique characteristics, it has been given its own taxonomic genus, Pandion and family, Pandionidae. 3 subspecies are usually recognized, 1 of the former subspecies cristatus has recently been given full species status and is referred to as the eastern osprey. Despite its propensity to nest near water, the osprey is not classed as a sea eagle.