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This is CBS, I in the World.

I'm John Batchel with Professor Dan Flores.

The book is Wild New World, the epic story of animals and people in America.

The large predators, the large mammals, mastodons, dire wolves, saber-tooth taggers, removed, opens up what Dan introduces me to call niches, and those niches have replacements. This is a profound turn

for the hunter-gathering group societies that spread across North America. Den, the filling of these niches, that's part of

a story that's ongoing through all of these epochs that we're talking about, that there's a

balance, and when that balance is disturbed, nature seeks stability again. Is that the way to read this, Professor?

Well, that is certainly a way to read it.

I would say that whenever a niche opens where there is, for example, the possibility of grazing

on immense grasslands that once had been home to mammoths and other grazing

creatures, what tends to happen in response and what happened in North America 10,000 years ago

is that an animal that is left, like the bison is going to expand into that niche that's been abandoned by other creatures.

And this is when we see the huge population explosion of the American bison into the millions that we think of in our last four or five hundred years of history.

And it's a smaller animal than the bison that had preceded it in the Pleistocene and are now extinct.

In fact, it's an animal that probably is shaped by the presence of human hunting and predation. So it has anthropogenic

...