The Collaborative International Dictionary of English v.0.48:

Coucal \Cou"cal\ (k??"k?l), n. [Prob. native name.] (Zool.)
   A large, Old World, ground cuckoo of the genus Centropus,
   of several species.
   [1913 Webster]

WordNet (r) 3.0 (2006):

coucal
    n 1: Old World ground-living cuckoo having a long dagger-like
         hind claw