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From The Collaborative International Dictionary of English v.0.48:
Unau \U*nau"\ ([-u]*n[add]"), n. [Brazilian.] (Zool.) The two-toed sloth (Cholopus didactylus), native of South America. It is about two feet long. Its color is a uniform grayish brown, sometimes with a reddish tint. [1913 Webster]