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This is Scientific Americans 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 PhD research at the University of Wyoming, Ellen Aikens tracked mule deer as they surfed the green wave.

The green up 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

roots were less sequential. So in essence drought compresses and reshuffles the green wave and just makes it so that this

foraging bonanza that deer depend on in their spring migration is really

...