The Collaborative International Dictionary of English v.0.48:

Kivikivi \Ki`vi*ki"vi\, Kiwikiwi \Ki`wi*ki"wi\, n.; pl.
   Kivikivies (?), Kiwikiwies. (Zool.)
   Any species of Apteryx, esp. Apteryx australis; -- so
   called in imitation of its notes. More commonly called
   kiwi. See Apteryx.
   [1913 Webster]