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 ...

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.

The red howler species is the most common, but it is often targeted by hunters eager for bushmeat. Other species of howler monkey may be critically endangered over sections of their ranges.

Perth Zoo is calling on the community to help find the perfect name for an adorable new addition to its monkey family. A baby Bolivian Squirrel Monkey was born to mum Reina two months ago and to ...