@cicerone imposter,
I know about all that ( 'human' migration, ice ages).
With the extensive trails of elephants I mean something completely different.
Imagine that cities en roads would be build in the Serengeti. The migration of gnoes, zebra's, antilopes would be disturbed. I'm shure that these animals would change their behaviour in one way or another. Also the predators would change. The disturbed balance caused by humans can then result in een population boom of one of the species involved. That's the only thing I want to say in response to the elephant population boom mentioned above by Arjuena.
Massai and other tribes were chased from their territory because it became a natural park gestured by 'whites'. They were going to protect nature. How can they protect nature better than those tribes whose way of living is completely in balance with that nature. Those tribes have lived there for thousands of years without disturbing anything. The intellectual white arrives and suddenly the nomadic tribes have to move.
Fortunately some 'wisdom' has dawned on some of these natural gamekeepers: in some natural parks the locals are permitted to live within the natural park and to hunt (quota's are set). These locals also prevent in a significant way poaching. If you ask me, what a long way to come to that insight.
To me, this is one of so many facts that indicate that the modern man with his GSM, pc, and magnetron meals is not part of nature and doesn't understand anything of it. To me the human brain is an anomaly in nature.
I said already that I'm not academically schooled. Perhaps that is not such a great loss. If I would be, I would probably have adopted the universal way of thinking of scholars (methodology). But I admit, it is also a weak point.