Eastern Bolivia, southern Brazil and Paraguay, and northern Argentina
Prefer tall, aged forests; occupy the middle and upper canopies of the trees
Canopy leaves, fruits such as figs and plums, buds, flowers and sometimes nuts
12 - 20 lbs.
Body 15 - 28 in. Tail 20 – 30 in.
180 – 194 days
1 – 2 (Usually 1)
Males and females are sexually dimorphic; adult males are black, adult females and juveniles are a golden tan color
Howler monkeys are the loudest primates in the Americas
Males do most of the howling. They can be heard 1.8 miles away
in the forest, and 3 miles away over water.
The hyoid bone in their throat is modified and forms a bony box called a corniculum. The corniculum is an egg-shaped pouch that acts as an amplifying chamber, enabling these monkeys to out- howl all other land animals.
Loud howls, grunts, roars and barks they use to defend territory
They are arboreal, diurnal, and have a prehensile tail.
Troop sizes range from 3 to 19. Troops commonly have 1 to 3 adult males and 2 to 7 adult females.
Faces threats from habitat loss due to agricultural development.
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