8. Monkeys make tools
Although it’s usually associated with apes, some species of monkey are able to use tools too. Black-striped capuchins have been observed cracking nuts on a rock by hitting them with another stone, and they will poke sticks into cracks in rocks to flush out invertebrates. Mandrills clean their ears and nails with twigs, and a troop of macaques in regular contact with people pull out human hair and use it as dental floss!