Why may the extinction of mammoths have forced us to invent civilization?

Why do we take so much time to invent civilization? Modern Homo sapiens it evolved for the first time approximately 250,000 to 350,000 years ago. But the first steps towards civilization, the harvest and then the domestication of crop plants, began only about 10,000 years ago, and the first civilizations appeared 6,400 years ago.

For 95 percent of the history of our species, we do not cultivate, we create large settlements or complex political hierarchies. We lived in small nomadic bands, hunting and gathering. Then something changed.

We pass from the life of hunter-gatherers to the harvest of plants, then to the cultivation and, finally, to the cities. Surprisingly, this transition occurred only after the ice age megafauna disappeared: mammoths, lazy land giants, giant deer and horses. The reasons why humans began to cultivate are still unclear, but the disappearance of the animals on which we depend for food may have forced our culture to evolve.