Among anthropoid primates there are interspecific differences in the degree of sexual dimorphism in both body size and canine
size. Within the suborder body size dimorphism and canine size dimorphism are positively correlated,
r=0.76. This correlation suggests that the two dimorphisms are equally developed in some species, while in other species there
is a differential degree of sexual dimorphism.
An analysis of these results and their relation to social organization and other ecological variables reveals: (1) the degree
of canine size dimorphism is closely related to the amount of male intrasexual selection in a given mating system; and (2)
the degree of body size dimorphism is also related to male intrasexual selection, but may be modified (either enhanced or
diminished) by selection pressure from factors such as habitat, diet, foraging behavior, antipredator behavior, locomotory
behavior, and female preference.