Physical description Mantled howler

a mantled howler monkey (alouatta palliata) calling, in tortuguero, costa rica



mantled howlers resting

the mantled howler s appearance similar other howler monkeys of genus alouatta except coloration. mantled howler black except fringe of yellow or golden brown guard hairs on flanks of body earning common name mantled howler monkey. when males reach maturity, scrotum turns white. females between 481 , 632 mm (18.9 , 24.9 in) in body length, excluding tail, , males between 508 , 675 mm (20.0 , 26.6 in). prehensile tail between 545 , 655 mm (21.5 , 25.8 in) long. adult females weigh between 3.1 , 7.6 kg (6.8 , 16.8 lb), while males typically weigh between 4.5 , 9.8 kg (9.9 , 21.6 lb). average body weights can vary between monkey populations in different locations. brain of adult mantled howler 55.1 g (1.94 oz), smaller of several smaller monkey species, such white-headed capuchin.

the mantled howler shares several adaptations other species of howler monkey allow pursue folivorous diet, is, diet large component of leaves. molars have high shearing crests, eat leaves, , males have enlarged hyoid bone near vocal cords. hyoid bone amplifies male mantled howler s calls, allowing locate other males without expending energy.