Our ancestors are believed to have evolved in a less forested, more open grassland environment than our cousins, the chimpanzees.This would have given them a clear view of large herbivores.

• 同我们的近亲-大猩猩相比,我们祖先的进化的环境拥有较少的树木更多开阔的草地,这样一来,给我们的祖先更清楚的看到食草动物的视野。