of the families Sapotaceae, Lecythidaceae, and Chrysobalanaceae, but they are known to feed on more than 100 species and are able to adapt their diets. They complement their diets with fleshy fruits and small insects. Black bearded sakis use their strong canine teeth to crack open hard shells of fruits and nuts, enabling them to access the unripe seeds inside the fruits. Social behavior They are social animals, commonly grooming and playing with one another, even with those of other primate species. Black bearded sakis can be found in troops of 20 to 30 individuals. Individuals of a troop will separate and rejoin throughout the day, have large home ranges, and travel long distances daily. Movement Black bearded sakis spend most of their time resting, traveling and eating. Black bearded sakis use mostly quadrupedal movement to move in the canopy of trees. As infants the monkeys can be seen using their tail to grasp things, but lose the ability as they mature. Reproduction Bearded sakis have a gestation period of 5 months and produce one young at a time. They become sexually mature at 4 years old and have an expected lifespan of 18 years. Black bearded sakis give birth to offspring every 2 years. Conservation Black bearded sakis are a critically endangered species. Just over the last few decades urbanization in the Brazilian Amazon has brought with it highways, agriculture, and dams, creating an influx of habitat fragmentation, habitat destruction and poaching pressure. Habitat fragmentation is rising as secondary roads increase and people move into uninhabited areas of the Amazon rainforest. Along with an influx of people the amount of agriculture required to support the area increases, augmenting the pressure for deforestation. Behavioral modifications due to forest fragmentation Studies reveal that black bearded sakis can adapt to habitat up to 3% the size of their original range. However, it is unclear whether this behavioral flexibility is sufficient for the long-term viability of this species in fragmented habitats. Forest fragmentation has resulted in behavioral changes that allow the species to adapt but could be detrimental for its conservation status in the long run. Black bearded saki groups will not leave isolated patches of fragmented forest unless the bridge of secondary forest grows. Groups in smaller patches of forest will tend to move and vocalize less while resting more. Population density will increase as habitat size decreases, causing a positive tendency