They are small primates (130 mm and 95 - 300 grams) with woolly thick fur that ranges from silvery grey to dark brown.

They have large eyes, giving them good night vision; strong hind limbs; and long tails, which help them balance.

Their ears are made up of four segments that can bend back individually, to aid their hearing when hunting insects at night.

Their omnivorous diet is a mixture of other small animals, including birds and insects, fruit, seeds, flowers, eggs, nuts, and tree gums.

[3][4] When a bushbaby roost was found, the chimps broke a branch from a nearby tree and sharpened the end using their teeth.