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Did Early African Hominids Eat Meat?

Anthropologists have thought that
 Australopithecus africanus, a small-brained hominid that walked upright but was probably also at home in the trees, subsisted on forest fruits and leaves, but on page
 368, researchers use a clever new method based on the chemical makeup of teeth to show that it ate a varied diet, including either grassland plants or animals that themselves fed on grasses. Many theories of human origins invoke a switch to a meat-rich diet to explain the sudden swelling of brain power in our own genus,
 Homo; the new data raise the possibility that meat-eating is not the exclusive province of
 Homo
 but a strategy adopted by more primitive species too.