Two-toed sloths spend most of their life hanging from trees, and are generally nocturnal animals. They are somewhat more active than three-toed sloths. Their body temperature depends at least partially on the ambient temperature; they cannot shiver to keep warm, as other mammals do, because of their unusually low metabolic rates and reduced musculature. Two-toed sloths also differ from three-toed in their climbing behaviors, preferring to descend head first. [Wikipedia]
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