Ibycter ater

from The Collaborative International Dictionary of English v.0.48

Caracara \Ca`ra*ca"ra\ (k[aum]`r[.a]k[aum]"r[.a]), n. (Zool.)
   A south American bird of several species and genera,
   resembling both the eagles and the vultures. The caracaras
   act as scavengers, and are also called {carrion buzzards}.
   [1913 Webster]

   Note: The black caracara is {Ibycter ater}; the chimango is
         {Milvago chimango}; the Brazilian is {Polyborus
         Braziliensis}.
         [1913 Webster]