The Johns Hopkins University Press. All rights reserved. This document may be used, with this header included, for noncommercial purposes within a subscribed institution . No copies of this work may be distributed electronically outside of the subscribed institution, in whole or in part, without written permission from the JHU Press . The upper parts generally are brownish, grayish, or blackish, and the underparts are paler.
Some forms have light-colored markings on the head or stripes on the thighs.
Reddish and whitish mutants also occur. The newborn are generally whitish. The body is slender, the tail long, the hands long and slender, and the thumb small, while the other fingers are well developed and strong. They are active throughout the tree canopy, occasionally descending to the ground to visit natural mineral sources. The diet consists mainly of leaves and seeds.