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All Old World monkeys, gibbons, and some chimpanzees have pads on their rears known as ischial callosities. [1] [2] The pads enable the monkeys to sleep sitting upright on thin branches, beyond reach of predators, without falling. Humans do not possess ischial callosities due to the gluteal muscles being large enough to provide the same ...
Some species have ischial callosities on their rump, which can change their colour during their mating periods. These monkeys are diurnal and live together in social groups. They live in all types of terrain and climate, from rain forests, savannah , and bald rocky areas, to cool or even snowy mountains, such as the Japanese macaque .
All baboons have long, dog-like muzzles, heavy, powerful jaws with sharp canine teeth, close-set eyes, thick fur except on their muzzles, short tails, and rough spots on their protruding buttocks, called ischial callosities. These calluses are nerveless, hairless pads of skin that provide for the sitting comfort of the baboon.
The hairs on the underparts are long and pale yellowish-orange. The ends of the limbs and the hands and feet are dark grey. The bare area of skin under the tail is bluish-grey tinged with pink, and the ischial callosities are pink. The long, grey tail has a tuft of longer hairs at the tip. [5]
A close-up of head. The fur coloring of the lar gibbon varies from black and dark-brown to light-brown, sandy colors. The hands and feet are white-colored, likewise a ring of white hair surrounds the black face.
The gelada (Theropithecus gelada, Amharic: ጭላዳ, romanized: č̣əlada, Oromo: Jaldeessa daabee), sometimes called the bleeding-heart monkey or the gelada baboon, is a species of Old World monkey found only in the Ethiopian Highlands, living at elevations of 1,800–4,400 m (5,900–14,400 ft) above sea level.
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Colobus satanas skull. The black colobus monkey is a large species with a head-body length of 50–70 cm and a long tail of around 80 cm. As in all Colobus species, the black colobus has a slender build and ischial callosities - tough pads of skin on the rump.