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This is Scientific American's 60-second science. I'm Scott Hirschberger.

Climate change is altering the migration routes of animals worldwide.

Here's a look at new research on how two species have been affected.

First, mule deer.

Every spring in Wyoming, vegetation first appears at lower altitudes before progressing up the

mountainside. Migrating mule deer follow and forage on this green wave. But as a changing climate

leads to more frequent and more severe droughts, the greenery is not as bountiful as it used to be.

For her Ph.D. research at the University of Wyoming, Ellen Aiken's tracked mule deer as they surfed

the green wave.

The greenup lasted across the landscape for about half as long in drought years in comparison

to wet years.

And also the order of green up along these routes were less sequential.

So in essence, drought compresses and reshuffles the green wave

and just makes it so that this forging bonanza

that deer depend on in their spring migration

is really compressed in time.

And although the deer were able to keep up

...