Why do the faces of some primates contain so many different
colors — black, blue, red, orange and white — that are mixed in all kinds of
combinations and often striking patterns while other primate faces are quite
plain?
UCLA biologists reported last year on the evolution of 129
primate faces in species from Central and South America. This research team now
reports on the faces of 139 Old World African and Asian primate species that
have been diversifying over some 25 million years.