Capuchins are New World primates with a small face, short limbs and a prehensile tail. Many species of capuchin — such as Brazil's yellow-breasted capuchin — are known for being adept at using tools, primarily to crack open hard-shelled nuts. Yellow-breasted capuchins are also one of the most endangered primates. Threats to this species include hunting, habitat loss and capture for the illegal pet trade.