Source : Webster's Revised Unabridged Dictionary (1913)

Red-tailed \Red"-tailed`\ (-t?ld`), a.
   Having a red tail.

   {Red-tailed hawk} (Zo["o]l.), a large North American hawk
      ({Buteo borealis}). When adult its tail is chestnut red.
      Called also {hen hawck}, and {red-tailed buzzard}.

Source : WordNet®

red-tailed hawk
     n : dark brown American hawk species having a reddish-brown tail
         [syn: {redtail}, {Buteo jamaicensis}]