[3] The species definitely occurs in the Atlantic lowlands of Panama close to the Costa Rica border.

[7] Other distinguishing features relate to its skull, which has a broad braincase, a depressed interorbital region, and large molariform teeth.

[7] It lives in small groups of between two and six monkeys, consisting of an adult pair and one infant and several juveniles and/or subadults.

At least nine vocal calls have been reported, including various types of grunts, screams, squeals, moans and trills.

[7] The Panamanian night monkey generally walks on all four legs, although it is capable of leaping or running when necessary.

In one study, on Barro Colorado Island in Panama, its diet was found to consist of 65% fruits, 30% leaves and 5% insects.

[6] The monogamous pair generally gives birth to a single infant each year, although twins occasionally occur.