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Orangutans
Humans aren’t the only primates who sleep on mattresses. Orangutans and other great apes bend and break foliage into complicated sleeping platforms, and they sleep deeply on them in trees or on the ground. Little orangutans practice making these platforms, also called nests, at only six months old, but it takes them until they’re around three or four years old before they get good at it. Researchers aren’t entirely sure why great apes build these platforms, but it may have originally been to avoid falling out of trees.
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