on their tail, arms, legs, and head. They get the name “bearded capuchin” because they tend to have darker faces, but lighter hair around their mouth and lower face. As they reach sexual maturity, they get dark spots on their head as well as sideburns on their face. Yet the features that most distinguish them include their orange fur on their neck as well as their yellow tinted fur on their dorsal side. Males and females often have a similar height of around 37 cm (14.6 in) but show strong sexual dimorphism in their weights, with males around 3.5 kg and females around 2.1 kg. Black-striped capuchins look very similar to other tufted capuchins, but importantly, they have a lighter coloration on the lower portion of their face, which earned them their name. The bearded capuchin can live up to 25 years in the wild, but much longer when in captivity. Behavior The black-striped capuchin is best known for its use of tools. Their use of tools can be found in many aspects of their life and they were the first non-ape primate to have been documented using tools. They have been known to take nuts, place them on a stone anvil, and use another stone to crack them open. Aside from that, they have also been seen using tools to dig in the ground. Using tools to dig, they can find foods like roots, tubers, as well as scare prey out of hiding spots. Sticks also seem to be used to probe as well as dip for honey in the wild. Stones play an interesting role in reproduction, as females will throw them at males for attention. The monkeys also have found ways to use tools as a form of intimidation. It has been shown that they also use stones to make loud noises in order to intimidate potential predators. Males have been seen to use sticks and tools more often than females. When studied, it was clear that females use tools at the same rate as males for the first 10 months, but after that, due to environmental surroundings, they use sticks less and less compared to males. This use of tools is a very well defined trait in black-striped capuchins and has been traced back over three thousand years. This is so well defined that the forearm muscles in black-striped capuchins are well defined for complex tool