Though they might look unusual to humans, proboscis monkeys are well-adapted to their tree-dwelling life in the mangrove swamps of Borneo. Their large fleshy noses are thought to create a resonating chamber for their mating calls, helping them to attract a mate, and their multichambered stomachs have colonies of bacteria that help them digest toxic leaves.

Biologist Patrick Ayree introduces this rather adorable arboreal primate in this clip from the Smithsonian Channel’s Amazing Monkeys.

Next: Spend a Day With the World’s Only Grass-Eating Monkeys, the greater sage-grouse’s courtship ritual, baby ring tailed lemurs cling to their mother in Madagascar, and what do baby sloths sound like?

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