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This is Scientific American 60-second science. I'm Emily Schweng.

When you look at satellite images, it's easy to pick out hurricanes, deserts, and the work of a certain semi-aquatic rodent.

And the reason you can see beaver activity from space is because they leave a mark on a landscape.

Ken Tape is an Arctic ecologist at the University of Alaska Fairbanks.

So they make these ponds.

And when a pond forms, my idea was that we could infer, if it was a certain kind of pond

and we could see a beaver dam, then we could infer that, you know, beavers had moved into

that area or moved out of that area if it's a beaver pond that's drained. Tape and a team of other scientists used Lansat satellite images that cover more than 19,000

square kilometers of Arctic tundra in Alaska.

We saw lots of new beaver ponds. I think we saw 56 new beaver ponds formed between 1999 and 2014.

Beavers are considered keystone species, which have an outsized effect on their ecosystem.

And I think it's particularly true in the Arctic because it's underlain by all the frozen ground.

He's talking about permafrost.

And what happens is when you start flooding permafrost areas, permafrost starts to

deteriorate and, you know, really the glue that's binding the soil together, that's holding a

landscape together, starts to thaw. Tape and colleagues presented their findings December 11th

at the annual conference of the American Geophysical Union. He says the

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