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 . Compiled from the sources cited above, this list of seven species is based to a large extent on studies involving cytogenetics. The upper parts are rufous, brown, or gray, and the underparts are white or yellowish. Except for the nail of the great toe, which is large and flat, the nails are keeled.
Females have a single pair of mammae, located pectorally.
They normally move by rapid leaps from one vertical support to another, using a powerful extension of the hind limbs. During the day, they sleep rolled up in a ball in a hollow tree or thick foliage. The territory of a large male may overlap those of up to five females, while that of a small male overlaps those of only one or two females. The animals are basically solitary, except that there may be some association between related females. Territorial defense against members of the same sex is very pronounced and occupies the greater part of an individual's time during the night.