What is "rough-legged buzzard"

Roughleg \Rough"leg`\, n. (Zo["o]l.) Any one of several species of large hawks of the genus Archibuteo, having the legs feathered to the toes. Called also rough-legged hawk, and rough-legged buzzard.

Note: The best known species is Archibuteo lagopus of Northern Europe, with its darker American variety ( Sancti-johannis). The latter is often nearly or quite black. The ferruginous roughleg ( Archibuteo ferrugineus) inhabits Western North America.

n. (Buteo lagopus), a medium-large bird of prey

The rough-legged buzzard (Buteo lagopus), also called the rough-legged hawk, is a medium-large bird of prey. It is found in Arctic and Subarctic regions of North America and Eurasia during the breeding season and migrates south for the winter. It was traditionally also known as the rough-legged falcon in such works as John James Audubon's The Birds of America.

Nests are typically located on cliffs, bluffs or in trees. Clutch sizes are variable with food availability but 3–5 eggs are usually laid. These hawks hunt over open land, feeding primarily on small mammals. Along with the kestrels, kites and osprey, this is one of the few birds of prey to hover regularly.