Source : Webster's Revised Unabridged Dictionary (1913)

Moa \Mo"a\, n. [Native name.] (Zo["o]l.)
   Any one of several very large extinct species of wingless
   birds belonging to {Dinornis}, and other related genera, of
   the suborder {Dinornithes}, found in New Zealand. They are
   allied to the apteryx and the ostrich. They were probably
   exterminated by the natives before New Zealand was discovered
   by Europeans. Some species were much larger than the ostrich.

Source : WordNet®

moa
     n : extinct flightless bird of New Zealand