Discover the fascinating Pig-tailed Langur (*Simias concolor*), a critically endangered primate native to the Mentawai Islands of Indonesia. Characterized by its unique short, pig-like tail and expressive face, this tree-dwelling monkey plays a vital role in its forest ecosystem by aiding in seed dispersal. Learn about their social behaviors, distinctive physical traits, and the urgent conservation efforts needed to protect these remarkable creatures and their habitats.