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]