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Male mantled howler. Howler monkeys have short snouts and wide-set, round nostrils. Their noses are very keen, and they can smell out food (primarily fruit and nuts) up to 2 km away. Their noses are usually roundish snout-type, and the nostrils have many sensory hairs growing from the interior.
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]
Brown howler monkeys are folivores and frugivorous. The diet of the brown howler monkey consists primarily of leaves and trees. Of the food sources it seems that the genera Ficus, Zanthoxylum, and Eugenia are the most significant types consumed. Brown howler monkeys that live in higher latitudes tend to eat a lower percentage of leaves in their ...
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]
The majority of the New World monkeys (though several taxa consume insects, some as a primary food source); predominantly or wholly herbivorous New World monkeys include the spider monkeys, muriquis, woolly monkeys, howler monkeys, sakis, and uakaris, [490] among others; Virtually all Old World monkeys (sensu stricto, excluding apes) [491]
For people in the steamy, swampy, jungle-covered state of Tabasco, the howler monkey is a cherished, emblematic species; local people say the monkeys tell them the time of day, by howling at dawn ...
Red howler monkeys have a muscular, prehensile tail that enables them to grasp branches or even swing from them. The males are about 20.6 -22.4 inches in height and weigh about 13-17 lbs. The females are a bit smaller at only about 18.4- 19.6 inches and 10-14 lbs.in weight. Their arms and legs are long. The howler hands are strong and dexterous.