From The Collaborative International Dictionary of English v.0.48:

Wallaby \Wal"la*by\, n.; pl. Wallabies. [From a native name.]
   Any one of numerous species of kangaroos belonging to the
   genus Halmaturus, native of Australia and Tasmania,
   especially the smaller species, as the brush kangaroo
   (Halmaturus Bennettii) and the pademelon ({Halmaturus
   thetidis}). The wallabies chiefly inhabit the wooded district
   and bushy plains. [Written also wallabee, and whallabee.]
   [1913 Webster]
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