Eating grass helped early hominins abandon the forests

Our early ancestors in Central Africa, between three million and 3.5 million years ago, munched mainly on tropical grasses and sedges - a much earlier change in diet than previously believed.

Human ancestor ate bark like a chimp

Bits of food stuck between the teeth of a two-million-year-old South African hominid show that, unlike almost all other known human ancestors, it ate tree bark and other hard foods.