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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 Maranhão red-handed howler (Alouatta ululata) is an endangered species of howler monkey endemic to forests (for example Babaçu forests) in the northeastern Brazilian states of Ceará, Maranhão and Piauí. [1]
The northern brown howler is endemic to the Minas Gerais province of Brazil and the southern part of Bahia state. Its range extends from the Atlantic coast to the Rio Pardo and Águas Vermelhas in the north, and to the Jequitinhonha River and Virgem da Lapa to the west and south, largely delineated by the inland extent of the coastal rainforest belt.
The red-handed howler remained variable in ecology, colour and pattern of the fur, shape of the cranium, and shape of the hyoid bone (of great importance in the voice of the howler monkeys; a likely isolating mechanism between the species), [5] but a geographical pattern was not clear, resulting in it being treated as a monotypic species. [3]
Scientists have recently discovered a new primate species in Myanmar’s central forest. However, the Popa langur, named after nearby Mount Popa, is tragically already on the verge of extinction.
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 ...
The mantled howler shares several adaptations with other species of howler monkey that allow it to pursue a folivorous diet, that is, a diet with a large component of leaves. Its molars have high shearing crests, to help it eat the leaves, [ 12 ] and males have an enlarged hyoid bone near the vocal cords. [ 13 ]