although modern humans and their close relatives such as chimpanzees have no grass as staple food, but a new study shows that about three million years ago the ancient migrating from forest to grassland, are under pressure to survive, had a lot to feed on grass.
researchers at Oxford University and other institutions in the new issue of the proceedings of the national academy of sciences, the report says Chad unearthed in Africa some 3 million to 3 million years ago, ancient human teeth fossils analysis found that the percentage of carbon isotope characteristics similar to some grasses, explain the ancient food may contain a lot of grass.
researchers think that of grass for paleoanthropology may be hard to digest, they eat more is likely to be the grass roots.
Juliet, a professor at the university of Oxford & middot; Lee said thorpe, eating grass in the human and primate relatives are not common, life of chimpanzees in Africa today, although have a lot of grasses in the surrounding environment, but does not feed on grass. One exception is the baboons live in grassland, today still feed on grass. But surprisingly, 3 million years ago human food class implied the proportion, probably higher proportion than baboons food wood used today.
she thinks, eating grass is ancient from forest to prairie migratory behavior are under pressure to survive. The forest is rich in fruit, but fruit grasslands relatively scarce, then the ability of human hunting wild animals also is weak, so can only try to eat grass. Eating grass make human get rid of the dependence on forest to spread to all over the world.