Siberut macaque

The Siberut macaque (Macaca siberu) is a vulnerable species of macaque that is endemic to Siberut Island in Indonesia. Fuentes and Olson first described it in 1995 as a subspecies of the Pagai Island macaque, under the name Macaca pagensis siberu. In 2002 Andrew Kitchener and Colin Groves re-examined the available specimens and compared it with the other members of the Macaca nemestrina group, found it to be morphologically very distinct and concluded that it should be recognised as a separate species. It was formerly considered conspecific with the Pagai Island macaque, which is overall paler in colour, but that arrangement was polyphyletic, and both were once treated as subspecies of the southern pig-tailed macaque.