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Orangutans are pretty unique among the great apes. They’re the only species of ape that spends most of its time in trees, as well as the largest tree-dwelling mammal on the planet. While they’re especially adapted to life in trees, the word “orangutan” actually means “forest person.” Locals originally thought that these hairy cousins of ours were simply people hiding in the woods to avoid farm work. A very sociable species, these big goofballs love the company of other orangutans or even other species. They’re pretty clever as well, figuring out all sorts of novel uses for various items.