The Dawn of Man: Interesting detail

Just watched this again recently, I noticed something in the first 'act':

At the beginning we see a dry arid planet with a few animals but very little vegetation. After the ape has the epiphany about using animal bones as weapons to kill other animals, we then see him eating some sort of meaty substance which we can assume is from one of the dead animals (is it a tapir?). If you look at that scene you'll see that straight away there is more grass or vegetation in this shot.

To me, that suggests that the other animals were over-grazing the land and clearing it of any kind of plant life before it could grow. By killing those animals, more plants were allowed to grow, meaning the land could become more lush and fertile.

Anyone else notice this?