Understanding the human body is a team effort. That's where the Yachtel group comes in.

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To learn more about Yachtolt, visit yawcult.co.

.j.p. That's Y-A-K-U-L-T.C-O.J.P. When it comes to a guide for your gut, count on Yacult.

This is Scientific American 60-second science. I'm Julia Rosen. Got a minute?

Polar bears live most of their lives on floating rafts of sea ice, hunting for seals.

But in the Arctic Ocean north of Alaska, the cold polar wind constantly blows that ice from east to west,

which means that the polar bears there are on a kind of treadmill.

If the bears don't compensate that drift, they would all drift to Russia.

So over the course of a year, they need to walk back against that prevailing drift to remain in the Alaska territories.

David Douglas, a biologist with the U.S. Geological Survey in Juneau, Alaska.

Recently, researchers realized that the ice drift in this part of the Arctic Ocean

has accelerated from about three kilometers per day up to five. That's probably because climate change

has made the sea ice thinner and easier for the winds to push. And that means the polar bear treadmill

has sped up too. Douglas and his colleagues tracked Alaska and polar bears fitted with radio collars. They found that

the animals are working harder than ever to compensate for the faster drift. And just like when we

exercise, bears have to eat more food to make up for the extra calories they're burning, between

one and four more seals per year, depending on whether the bears are single or raising cubs.

Well, that may not seem like a lot of seals are a big demand, it also comes at a time

when the habitat that they have to hunt in is shrinking, so they have less area on which

to hunt seals at the same time needing to hunt more.

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