Dictionary of Human Evolution and Biology

  • -id > 9:3

Theropithecus I. Geoffroy, 1843

Monotypic catarrhine genus to which the gelada baboon belongs. Found in open areas and rocky gorges in the mountains of northern and central Ethiopia. Considered the most terrestrial of the nonhuman primates; diurnal; quadrupedal. Marked sexual dimorphism in teeth, body size, and other superficial features such as whiskers and a shoulder cape on the males. Body mass range 10-13 kg for females, 18-21 kg for males. Dental formula:; only primate considered to be graminivorous. They sit on their haunches while feeding; both sexes have patches of skin on the chest, but the female’s skin becomes bright pink during estrus; this signaling of estrus may be the result of the gelada feeding posture, which would hide sexual skin on the ischial callosities. Social organization consists of one-male units, which fuse into larger cliff-sleeping troops at night, sometimes numbering 400 animals; unattached males live in bachelor herds within this larger group.

Full-Text Search Entries