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However, the black howler monkey (Alouatta caraya) is a relatively common pet in contemporary Argentina due to its gentle nature (in comparison to the capuchin monkey's aggressive tendencies), in spite of its lesser intelligence, as well as the liabilities of the size of its droppings and the male monkey’s loud vocalizations.
Howling is a vocal form of animal communication seen in most canines, particularly wolves, coyotes, foxes, and dogs, as well as cats and some species of monkeys. [ 1 ] [ 2 ] Howls are lengthy sustained sounds, loud and audible over long distances, often with some variation in pitch over the length of the sound.
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 ...
[3] [1] Male howler monkeys have an unpaired rostroventral laryngeal air sac within the hyoid bulla (extension of the hyoid bone) and a pair of ventral laryngeal air spaces outside. [4] The hammer-headed bat has a pouch in the palatine that connects to an enlarged nasopharynx region, in addition to paired cheek pouches which extend to the ...
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]
Scientists found that howler monkeys with louder calls have smaller testicles
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.
Compared with members of the howler monkey genus, the Mexican howler is sympatric with the Guatemalan black howler, A. pigra, in Tabasco, Mexico. [3] The Mexican howler differs from the golden-mantled howler, A. palliata palliata, primarily in aspects of skull morphology, and in some differences in pelage. [3]