Harrier hawk

from The Collaborative International Dictionary of English v.0.48

Harrier \Har"ri*er\, n. [From {Harry}.]
   1. One who harries.
      [1913 Webster]

   2. (Zool.) One of several species of hawks or buzzards of the
      genus {Circus} which fly low and harry small animals or
      birds, -- as the European marsh harrier ({Circus
      [ae]ruginosus}), and the hen harrier ({Circus cyaneus}).
      [1913 Webster]

   {Harrier hawk} (Zool.), one of several species of American
      hawks of the genus {Micrastur}.
      [1913 Webster]