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The drill is a short-tailed monkey up to 70 cm (28 in) long, similar in appearance to the mandrill, but lacks the bright blue and red on the face of that species. It has high sexual dimorphism in weight, with males weighing up to 20 kg (44 lb) and females up to 12.5 kg (28 lb). [4] A close-up of face. The body is overall a dark grey-brown.
The most common monkey species found in animal research are the grivet, the rhesus macaque, and the crab-eating macaque, which are either wild-caught or purpose-bred. [66] [67] They are used primarily because of their relative ease of handling, their fast reproductive cycle (compared to apes) and their psychological and physical similarity to ...
The mantled howler is one of the largest Central American monkeys, and males can weigh up to 9.8 kg (22 lb). It is the only Central American monkey that eats large quantities of leaves; it has several adaptations to this folivorous diet. Since leaves are difficult to digest and provide less energy than most foods, the mantled howler spends the ...
The monkey's size differs depending on sex and species. Males from all species can range from 41 to 70 cm (16 to 28 inches) in head and body length, and in weight from 5.5 to 18 kg (12.13 to 39.7 lb). [6] Females can range from a weight of 2.4 to 13 kg (5.3 to 28.7 lb).
This adaptation to their strictly arboreal lifestyle serves as a fifth hand. [14] When the monkey walks, its arms practically drag on the ground. Unlike many monkeys, they do not use their arms for balance when walking, instead relying on their tails. The hands are long, narrow, and hook-like and have reduced or nonexistent thumbs. [15]
Unlike most New World monkeys, in which one sex remains in natal groups, juveniles of both sexes emigrate from their natal groups, [9] such that howler monkeys could spend the majority of their adult lives in association with unrelated monkeys. Physical fighting among group members is infrequent and generally of short duration, but serious ...
Night monkeys, also known as owl monkeys or douroucoulis [2] (/ d uː r uː ˈ k uː l i z /), are nocturnal New World monkeys of the genus Aotus, the only member of the family Aotidae (/ eɪ ˈ ɒ t ɪ d iː /). The genus comprises eleven species which are found across Panama and much of South America in primary and secondary forests, tropical ...
The rhesus macaque (Macaca mulatta), colloquially rhesus monkey, is a species of Old World monkey. There are between six and nine recognised subspecies split between two groups, the Chinese-derived and the Indian-derived.