Prolemur broad-nosed (Prolemur simus) - a species of mammal from the lemur family (Lemuridae). It represents the monotypic genus of Prolemur. Endemic species of Madagascar. In the Red List of Threatened Species by the International Union for Conservation of Nature (IUCN), placed under the category of Critically Endangered Species (CR). Formerly it was widely distributed in many parts of the island. Due to the destruction of the environment and hunting, its population has been limited to about 500 individuals (data from 2012) . The broad-nosed prolemur is associated with areas with large clusters of bamboo. Found at altitudes from 20 to 1600 m above sea level. Active day and night. It lives in polygamous groups that occupy the territory of 40–60 ha or more. The mating season begins in May or June, and the young are usually born in October and November. Females usually give birth to one young each year after a gestation period of about 150 days. They reach sexual maturity at the age of about two years. In captivity, individuals who lived over 17 years were observed .