Black Howler Monkey

Living in extended family groups, howler monkeys spend most of the day feasting on leaves in the treetops. As a group, they howl to defend their territory. The howling is so loud and deep that it can be heard from nearly two miles away, thanks to a deep jaw and specialized voice box.

White-Faced Saki

It’s easy to tell whether an adult white-faced saki monkey is male or female. The males are all black except for the white fur around their faces while the females are overall brown.


Golden-headed Lion Tamarin

Golden-headed lion tamarins are tree-dwelling monkeys that live in small social groups with a single breeding female. Offspring often remain in the group as they mature to help raise their younger siblings, thereby sacrificing their own reproductive opportunities.

Coquerel’s Sifaka

The sifaka is a large lemur built for a specialized type of locomotion called vertical clinging and leaping. Maintaining an upright posture, it uses its powerful legs to jump from tree to tree. Active by day, the sifaka sleeps in small groups high up in the treetops to avoid predators at night.

Pygmy Slow Loris

The solitary, female loris usually bears one young at a time. The infant clings to its mother’s belly for a few days. Soon, the mother will leave the young one behind, a behavior called “parking,” as she heads out at night to forage. The young loris relies on camouflage and toxic secretions as defense against predators.


Like a woodpecker, the aye-aye is a percussion forager. Tapping on a dead log with its especially long and thin middle finger, the aye-aye listens closely for signs of insect larva inside. It chisels a hole in the wood with its ever-growing incisors and extracts the larva with its finger.

White-Handed Gibbon

Like other gibbons, the white-handed gibbon is an expert at traveling in the trees. Arms that are longer than its legs allow the gibbon to cover a great distance—nearly 10 feet—with each pendulum swing of its body. Forward-facing eyes provide it with the binocular vision and depth perception necessary to determine a safe route.

Sumatran Orangutan

Orangutan means “person of the forest” and is a fitting name for a primate that is happy to spend its day hanging out in the treetops. The only truly arboreal ape, the orangutan is also the largest tree-dwelling animal.



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Gibbons are known for their vocal abilities. Male and female pairs duet to strengthen their bond and defend their territory. The largest of all gibbons, the siamang is also the loudest as its musical calls can be heard through dense rainforest foliage up to two miles away.

Ring-tailed Lemur

Ring-tailed lemurs live in social troops of a dozen or so, led by a single, dominant female. Lemurs have pungent scent glands they use for communication and even battle. Male ring-tailed lemurs compete for mates by smearing scents from forearm glands onto the tips of their tails.