Piliocolobus tholloni

The Chuapa River red colobus monkey is 47-63 cm long, with a tail length of 53-75 cm and a weight of 5-10 kg. The hair on the top of the head, back, outer side of the upper arm, forehead, outer thigh, tail and other parts is gray to dark black; the pubic area is white; the hair on other parts is light orange to orange-red. The cheek pouch is also smaller than that of ordinary monkeys, and the thumb has degenerated into a small wart, so it is called a colobus monkey.

The Chuapa red colobus is a little-known species that occurs in patches from the southern Congo River loop, west of the Lomami River in the Democratic Republic of the Congo, primarily along the Tshuapa River. This is the only population of red colobus remaining south of the Congo River.

The Tshuapa Red Colobus (scientific name: Piliocolobus tholloni) was once a subspecies of the Tana River Red Colobus and was classified as an independent species in 2013. It mainly feeds on plant food such as leaves. Its thumb is degenerate, while its big toe is thick, and its hind limbs are usually longer than its front limbs.

Listed in the 2016 Red List of Endangered Species of the World Conservation Union (IUCN) ver 3.1 - Near Threatened (NT).

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