Primates have been relying on facial expressions to delineate friends from predators for thousands of years and new research purports that increasing group size puts more pressure on the evolution of coloration across different sub-regions of primates’ faces.
International Business Times reports on these new findings from biologists from the University of California Los Angeles.
“Social pressures have guided the evolution of the enormous diversity of faces we see across the group [Old World African and Asian primates species] ,” Michael Alfaro,