rough-legged buzzard

from The Collaborative International Dictionary of English v.0.48

Roughleg \Rough"leg`\, n. (Zool.)
   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}.
   [1913 Webster]

   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.
         [1913 Webster]