The howler monkey (Alouatta sara) is a primate mammal, endemic to Bolivia.

It lives in tropical forests below 1,000 m of altitude, in the departments of Beni and Santa Cruz.

It is seen in pairs and groups of up to 12 individuals, in which there are only 1 or 2 adult males. They usually give birth to a single calf.

 

Leaves and fruits are the main source of energy and protein.

In the wild cacao plantations of the Baures jungle, it helps in the dissemination of cacao seeds, a factor that generates the constant propagation and renewal of cacao trees.