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This is Scientific American 60 Second Science. I'm Emily Schweng. Got a minute?

It's long been thought mammoths and mastodons rambled over North America's Arctic and sub-Arctic realms between 75 and 10,000 years ago,

and were made extinct by hungry new arrivals on the scene, human beings.

But new evidence indicates mastodons probably roamed the scene, human beings. But new evidence indicates Mastodons

probably roamed the region as far back as 120,000 years ago, and they were gone before the first

people showed up. For at least the story with the Mastodon, we now know that in what we call

Beringia, Alaska, parts of Yukon, and over into northeastern Asia,

they were wiped out in those areas for things that had nothing to do with humans

because they all died out before there were humans there.

Pat Druckenmiller is the curator of Earth Science at the University of Alaska Museum of the North.

Humans could not have been part of the story, and that's pretty interesting.

The research is in the proceedings of the National Academy of Sciences.

Drucken Miller and co-authors were led to these conclusions after colleagues at the Yukon

Paleontology Program in Canada decided to redate nearly 40,000 specimens because American mastodons

are often mistaken for their much hairier woolly mammoth cousins,

who hung around the area later. A mammoth and a mastodon can be immediately distinguished on the

basis of their teeth, their big cheek teeth. The surface of a mammoth tooth looks like a washboard,

...