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1834, Augustus Addison Gould, editor, A System of Natural History, page 264:
The unau, or two-toed sloth, has no tail, and only two nails on the fore feet. The ai, or three-toed sloth, has a short tail, and three nails on every foot. The nose of the unau, is likewise much longer, the forehead higher, and the ears longer than those of the ai.