From 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]
From 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]