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19 Insanely Weird Animals

The Two-Toed Sloth

The Two-Toed Sloth

A sloth gives a thousand-yard stare at the Brookfield Zoo in 1938. Weird fact: This species' metabolism is so slow that it can take a month to digest food. Depending on where in the digestion process it is, up to 30 percent of a sloth's body weight can be its own, ahem, waste.

Photo: William Vandivert./Time & Life Pictures/Getty Images

Jan 01, 1938