habitat Distribution The Prince Bernhard's titi monkey is endemic to Brazil, specifically the states of Amazonas and Rondônia, and possibly Mato Grosso, although its presence in the third is uncertain, having possibly been sighted in Alta Floresta. It is found between the Madeira and Aripuanã rivers. The range of P. bernhardi overlaps with those of P. cinerascens and P. hoffmannsi at the headwaters of the Juruena, Aripuanã, and Roosevelt rivers. They occur in protected areas, including Ipixuna Indigenous Land. Habitat P. bernhardi prefer to live in disturbed forest, either naturally disturbed or disturbed by humans. Specifically, they enjoy to live in blow-downs (swathes of secondary forest affected by massive storms), liana forests, forests near plantations and fields, and seringais. Seringais are a type of agroforestry where forests grow along white-water rivers. Commercially important trees in these forests include rubber, Brazil nut, and cacao. Behavior Diet Prince Bernhard's titi monkeys have been observed feeding on the fruits of Oenocarpus distichus and Orbignya phalerata, younger leaves and fruit of plants of the genus Inga, and shrubs and lianas of unknown classification. Vocalizations In the early morning, before dawn, all the pairs in one area often begin to perform duet calls together. Thermoregulation To keep their metabolism functioning as it should Prince Bernhard's titi monkeys practice thermoregulation behaviors when they are not at their ideal temperature to keep their metabolism in balance. In higher levels of heat, especially over , they avoid sunny places, although they begin to use heat-dissipating postures at as low as . Higher levels of humidity also lead to a greater use of these behaviors. While individuals huddle together in the night, with tails entwined, this behavior does not correlate to temperature, suggesting it is instead practiced to satisfy social needs. Conservation The Prince Bernhard's titi monkey is of least-concern by the International Union for Conservation of Nature (IUCN). The organization considered it to not be at risk due to its large range and lack of human impact on its habitat. They concluded that it has a stable population and no known threats. However, later research efforts found that its habitat, in the Arc of Deforestation (an area in the southeastern Amazon rainforest defined by heavy deforestation), was at risk. It is estimated that it will lose 44.5 percent of its current range over the course of the next 24 years (three generations for this species). From this study,