The island is one of the habitats of the proboscis monkey. They are home to the proboscis monkey. The zoo obtained collared mangabeys in 2016, who live on the old proboscis monkey island. Predators of the proboscis monkey include crocodiles, clouded leopards, eagles, monitor lizards and pythons. The proboscis monkey is named for its enormous nose. The proboscis monkey is protected by law in all regions of Borneo. As a seasonal folivore and frugivore, the proboscis monkey eats primarily fruit and leaves. Aside from this, the proboscis monkey is largely arboreal and moves quadrupedally and by leaps.