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Skull of male mandrill, showing the long canines and ridged bone swellings. The mandrill has a stocky body with a large head and muzzle, as well as a short and stumpy tail. [19] The limbs are evenly sized and the fingers and toes are more elongated than those in baboons, [20] with a more opposable big toe on the feet. [21]
The mandrill displays the most extreme sexual dimorphism for weight among all primates, with a male-female weight ratio of 3.2 – 3.4 at eight to ten years of age. [21] Similarly, drills are one of the most sexually dimorphic primates for body weight, with a male growing up to 32 kg while a female grows to 12 kg.
For example, in mandrills (Mandrillus sphinx), males display extensive red and blue coloration on their face, rump and genitalia as compared to females. Male mandrills also possess a yellow beard, nuchal crest of hair, and pronounced boney paranasal ridges, all of which are absent or vestigial in females. [5]
Mandrills are among the largest species of monkeys. Male mandrills famously sport bright red and vibrant blue cheeks as well as blue rumps.
Prior to Ruby and Jasper, only two other mandrills were born at the Fort Worth Zoo, a female in 1992 and a male in 1995, according to NBC Dallas-Fort Worth. The Fort Worth Zoo is home to nearly ...
The largest is the male mandrill, around 70 centimetres (28 in) in length, and weighing up to 50 kilograms (110 lb) [6] Old World monkeys have a variety of facial features; some have snouts, some are flat-nosed, and many exhibit coloration. Most have tails, but they are not prehensile.
A high-ranking male mandrill advertises his status with bright facial coloration. [1]In the zoological field of ethology, a dominance hierarchy (formerly and colloquially called a pecking order) is a type of social hierarchy that arises when members of animal social groups interact, creating a ranking system.
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