Sloths fits into the order Xenartha, mammals with unique joints in their backbone, have few or no teeth and a small brain. Armadillos and anteaters are in the same super-order as the sloth.
The two kinds of sloths at the Sanctuary are Bradypus variegatus (Three-fingered sloth) and Choloepus hoffmanni (Two-fingered sloth).
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