> The comment seems incorrect. Herds are good for the soil. They flatten grasses keeping moisture in, allowing for more growth. In the past, people believed the

> The comment seems incorrect. Herds are good for the soil. They flatten grasses keeping moisture in, allowing for more growth. In the past, people believed the opposite - and this is perhaps still believed in parts of the world. For some reason, the idea of complex organisms (in this case: mammals) migrating to new lands and fertilizing it seems counter-intuitive to me, but it does make sense in some way. I would've assumed that more simple organisms took this land long before mammals emerged. The biggest gripe I'd have with it would be: why would they move into those lands? There's nothing there for them. But the idea of them slowly extending fertilized soil does seem intriguing. It appears sort of counter-factual to me that we, who are (presumably) even more complex, seem to reverse this process. There seems to be a sweet-spot in evolution of a species to benefit the land on which they live on (and that around it), and we seem to be past it.