If we look across the whole of the mammal branch of the tree of life, we find there are many groups of mammals that have ...

Abyssinian black and white colobus monkey and bonnet macaque adult males are roughly the same size. But, like chimps, humans and gorillas, these similar monkeys have vastly dissimilar testicles.

Abyssinian black and white colobus monkey and bonnet macaque adult males are roughly the same size. But, like chimps, humans and gorillas, these similar monkeys have vastly dissimilar testicles.

Abyssinian black and white colobus monkey and bonnet macaque adult males are roughly the same size. But, like chimps, humans and gorillas, these similar monkeys have vastly dissimilar testicles.

Alister Brown, B.A. Psychology, University of Arkansas Faculty advisors: Dr. Kara Gabriel Research interests: Effects of environmental stressors (mainly human related eg. deforestation, hunting, ...