and body length is 240-370 mm and tail length is 316-400 mm.
Weight range from 0.6 to 1.0 kg. The soft, dense fur is silvery
gray to dark gray above and gray, buff or brownish beneath.
There are three dark brown or black lines radiating from the
outer edges of the eyes and the bridge of the nose to the top
of head and these are bordered by gray. The eyes are very large
and closely set. The muzzle is unfurred and the ears are quite
small. The densely furred tail is nonprehensile. There is a
sac below the chin which can be inflated at will and gives resonance
to the voice.
Aotus are found in forests from sea level to 2,100 meters.
Owl monkeys are nocturnal and arboreal, sleeping in nests during
the day in tree hollows and woody vines. The diet consist mainly
of fruits, nuts, leaves, bark, insects, gums and small vertebrates.
Family groups are comprised of two to five individuals including
an adult pair and their offspring from the last three breeding
seasons. There is a single 80 gram baby born after a gestation
period of 150-153 days. Sexual maturity is reached at 2 years
of age for both males and females.
A. trivirgatus is found in Venezuela, south of Rio Orinoco,
south to Brazil, north of Rios Negro and Amazon.