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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 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]
Usually, howler monkeys have a single dominant male, with multiple adult females and babies in smaller groups. [13] In larger groups, the howler monkeys' group composition can vary. [ 13 ] In a 2009 study by Lucas M. Aguiar, Gabriela Ludwig, and Fernando C. Passos, in the Upper Paraná River of southern Brazil, the black and gold howler groups ...
The Ecuadorian mantled howler (Alouatta palliata aequatorialis) is a subspecies of the mantled howler, A. palliata. It ranges from Panama (or possibly the eastern tip of Costa Rica) through Colombia and Ecuador into northern Peru. [2] The range limits between the Ecuadorian mantled howler and the golden-mantled howler are not
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 ...
Scientists found that howler monkeys with louder calls have smaller testicles
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 southern brown howler (Alouatta guariba clamitans) is a monkey subspecies of brown howler native to southeastern Brazil (Minas Gerais to Rio Grande do Sul) and far northeastern Argentina . [1] Gregorin, 2006, considered the southern brown howler to be a separate species, Alouatta clamitans , but this has not been universally accepted.