Chimpanzees and capuchin monkeys use tools to get food. Primates often groom each other by picking off dirt and ticks, not just to stay clean, but also to build friendships and settle fights.

When one member of a subgroup mastered the task, the others quickly imitated them, with the result that 57.5% of the monkeys managed to retrieve the food reward. In the smaller, closer-knit groups ...

Especially impressive are Capuchin monkeys, who’ve been caught cracking ... Do you know any furry fun facts you’d like to ...