The finding also applies to Australopithecus africanus, a closely related species from southern Africa. But the two species did not share the same degree of difference. That gap between them, ...

The largest males have bigger weapons, but smaller males have other advantages. Photo by Ummat Somjee When it comes to some members of the insect world, size variations can be mind-boggling. A ...

A newly published study has found that males of some of our earliest known ancestors were significantly larger than females. The pronounced difference in body size present in both Australopithecus ...