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 ...

What is a woolly monkey? An animal called a woolly monkey ... in the forests and cloud forests of Peru, Columbia, Ecuador, Bolivia, and Brazil. Woolly monkeys were once considered four species ...