Proboscis monkey facts: why males have huge noses, how they swim with webbed feet, their leaf-fermenting pot belly, mangrove habitat and endangered status.

The golden snub-nosed monkey of China: blue face, golden coat, lichen diet, huge multi-level bands and why this endangered species survives freezing mountain winters.

Japanese macaque guide: the northernmost non-human primate, famous for hot spring bathing, sweet potato washing and thick winter coats in snowbound valleys.

Mandrill facts: the world largest monkey, with a scarlet and blue face, 35 kg males, huge canines and supergroups of over 800 animals in Central Africa.

Vervet monkey facts: the African monkey famous for predator-specific alarm calls, blue-skinned males, crop raiding and a social system studied for fifty years.

Squirrel monkey guide: tiny New World primates with the largest brain-to-body ratio of any monkey, huge troops, insect-heavy diets and a distinctive skull cap.

A complete howler monkey guide: how their calls carry three miles, why they eat mostly leaves, troop structure, species list and conservation threats.

Spider monkey facts: the fully prehensile tail, hook-like hands with no thumb, fruit-heavy diet, fission-fusion society and why most species are endangered.

Capuchin monkey facts covering size, lifespan, diet, tool use, social structure and why capuchins are considered the smartest New World monkeys.

There are roughly 260 to 270 recognised monkey species worldwide — about 160 Old World and 110 New World. Here is why the number keeps changing.