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A. How Gray Wolves Benefit Yellowstone National Park

Narrator: This is Science Today. Gray wolves, which were reintroduced to Yellowstone National Park in 1995, have changed the way other animals in the park search for food. A University of California, Berkeley study has shown that wolf packs help prevent the starvation of other animals during the winter months, by leaving behind carrion, which scavengers feed on. Study leader Chris Wilmers explains .

Wilmers:
   Wolves are constantly killing throughout the winter, providing smaller meals, but more constant. So if you're a coyote or an eagle and you're trying to get through the winter, there's constantly food for you to eat, rather than this sort of boom-bust cycle that existed before wolf reintroduction. 
 
Narrator: With more food available, Wilmers says scavengers now have a chance to live more robust lives during the lean winter months.
 
Wilmers: Other studies have shown that the availability of winter carrion is directly correlated with over winter survival, so they're more likely to live through the winter, and then second of all reproduction, so their reproduction output is likely to go up.
 
Narrator: For Science Today, I'm Larissa Branin.