The Collaborative International Dictionary of English v.0.48:

Weka \We"ka\, n. (Zool.)
   A New Zealand rail (Ocydromus australis) which has wings so
   short as to be incapable of flight.
   [1913 Webster]

WordNet (r) 3.0 (2006):

weka
    n 1: flightless New Zealand rail of thievish disposition having
         short wings each with a spur used in fighting [syn: weka,
         maori hen, wood hen]