The black-striped capuchin (Sapajus libidinosus), also known as the bearded capuchin, is a New World monkey in the family Cebidae. They can be found in northern and central Brazil. These capuchins mostly live in dry forests, and savannah landscapes between the Rio Araguaia and the Rio Grande. Known for its tool use, the black-stiped capuchin has been shown to use tools in a wide variety of situations, ranging from using rocks for nut cracking to using sticks for digging. They were, until recently, considered a subfamily of the tufted capuchin, but because of more research and insights, they are considered their own species by many. They often live in highly social groups ranging from 6-20 individuals. Females are philopatric, show coalition, and linear dominance hierarchy. Females reach sexual maturity around 5 years of age and give birth about every 24 months to a single infant. Taxonomy The black-striped capuchin is a New World monkey and a member of the Cebidae family, which contains both capuchins and squirrel monkeys. Until the past few decades, the black-striped capuchin was considered a subspecies of the tufted capuchin but has slowly become accepted as a separate species over time. Even within the black-striped capuchin species, we see more taxonomical debate, as the southern population is sometimes considered a species of its own as well, called Azaras's capuchin. Reproduction In black-striped capuchins, we see an interesting mating behavior. When a female decides she is ready to mate, she will follow a male around attempting to get his attention. This can happen in various forms, one that has been described is the act of throwing rocks and sticks. Males will react first with disinterest and aggression, this is followed by a behavior dubbed “touch and go”. Females will touch a male, and then flee before the male can inflict aggression. After some time, males react with interest and the pair can mate. Females have offspring on average once every two years to a single infant. This infant will be initially carried on the mothers belly, but will transition to her back. They forage independently at two years of age, and are weaned slowly. Physical description Black-striped capuchins have only a few physical features that distinguish them from other tufted capuchins. Similarly, to other tufted capuchins they have thick and strong tails. They have fur colored light to dark brown on their body, with darker black fur