Wildlife managers from all over Brazil have organized ... ranges from brown to dark red. Few Brazilian researchers paid any attention to brown howler monkeys when Hirano started working with ...

Howler monkeys have beards and long, thick hair which may be black, brown, or red. The red howler species is the most common, but it is often targeted by hunters eager for bushmeat. Other species ...

This photo is of a skull, mandible and hyoid bone of a red howler monkey, showing the enormous size of the hyoid relative to body size.

This is a computer generated 3-D model of a Bolivian red howler (Alouatta sara), with the hyoid bone in red. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases ...

and Brazil. Woolly monkeys were once considered four species: the gray, Columbian, silvery, and Peruvian yellow-tailed woolly monkeys. More recent genetic studies suggest there are only two ...