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Unlike other New World monkeys, both male and female howler monkeys have trichromatic color vision. [3] This has evolved independently from other New World monkeys due to gene duplication. [4] They have lifespans of 15 to 20 years. Howler species are dimorphic and can also be dichromatic (i.e. Alouatta caraya). Males are typically 1.5 to 2.0 kg ...
The black howler (Alouatta caraya) or black-and-gold howler, [2] is among the largest New World monkeys and a member of the Alouatta genus. [ 3 ] [ 4 ] The black howler is distributed in areas of South America such as Paraguay , southern Brazil , eastern Bolivia , northern Argentina , and Uruguay .
The Yucatán black howler is the largest of the howler monkey species and one of the largest of the New World monkeys. Yucatán black howler males are larger than those of any other Central American monkey species. On average, males weigh 11.4 kg (25 lb) and females weigh 6.4 kg (14 lb). [6]
Normally quite intimidating, howler monkeys are muscular and can be around 2 feet (60 centimeters) tall, with tails as long again. They are equipped with big jaws and a fearsome set of teeth and ...
The jawbone of the red howler monkey is large, especially the body of the mandible. The position of the foramen magnum is very posterior to make way for the expanded jaw and enlarged hyoid bone. Howler monkeys also have an inflated bulla, which is the bony encasement of the middle ear. This makes them an exception among other New World monkeys.
The mantled howler's appearance is similar to other howler monkeys of the genus Alouatta except for coloration. The mantled howler is primarily black except for a fringe of yellow or golden brown guard hairs on the flanks of the body earning the common name "mantled" howler monkey. [8] When the males reach maturity, the scrotum turns white. [9]
Normally quite intimidating, howler monkeys are muscular and some can be as tall as 90 centimeters (3 feet), with tails just as long. Some males weigh more than 13.5 kilograms (30 pounds) and can live up to 20 years. They are equipped with big jaws and a fearsome set of teeth and fangs.
Typical of its species, the Mexican howler monkey has a prehensile tail, a deep jaw, and a large pharynx which it uses to make characteristically deep and resonating howls. [1] Mantled howler monkeys are known for forming unusually large cohorts averaging 14 members and sometimes extending to 40 members.