Our new research on cranial variation on red howler monkeys (Alouatta seniculus), has been recently published in the American Journal of Primatology. Using geometric morphometric methods we suggest that allometry (which describes how the different body parts of an organism change with size) is the main source of variation involved in shaping cranial morphology in howlers, influencing the degree of facial proportions and braincase flattening, and generating the main sexual differences.

Our manuscript is now accessible in Early View using the following link: