[The Antiyuppie]

I would agree, but I think that it’s fairly obvious that our ancestors definitely “helped them out” in that area quite a bit. They would probably do fine in Alaska and Canada.

[pierrem15]

The one overwhelming anomaly at the end of the last Ice Age was the Younger Dryas, where temperatures fell dramatically quickly almost all the way back to full Ice Age cold for a few years. This may have been due to a comet impact on the eastern North American ice sheet near Quebec. Lake cores in Ireland show an astonishing drop in temperature over just three months.

The result would have been that the particular grassy tundra needed by Ice Age megafauna would have died before it could move south far enough to sustain the megafauna ecosystem.

A few pygmy mammoths survived until about 3000 years ago on arctic islands in the Russian far north.

[Louis Foxwell]

Or, for that matter, in Mongolia. A full 25% of the land mass of the earth is habitable ground for such cold loving beasts.