Certainly the Clovis people in North America lived for only a very short time (about 1000 years I think) before becoming something else-- 13000 years ago.

There distinctive trademark was the large bladed stone spearhead.

It appears that at the same time a number of the North American super-mammals were extincted.

This would be consistent with the impact of the Polynesians on New Zealand-- again a wave of extinctions, including the Dodo Bird.

I believe Diamond raises this point in Guns, Germs, and Steel. Clovis culture appears to be associated with the loss of North American mega fauna. The same loss of mega fauna is also found with hominid entry to the Australian continent.

Another interesting text is Sea of Slaughter by Farley Mowat. He documents the decline of all species in the Gulf of St Lawrence area with the arrival of European settlers.