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Study: Carnivores’ return helps Yellowstone streams

The widespread extermination of wolves and cougars early last century meant elk herds that the carnivores prey on were able to grow in size. The swollen herds ate away willow plants and other vegetation along the park's streams, causing erosion damage, a recent study says.

Widespread extermination of wolves, cougars early last century meant elk herds able to grow in size, eating away willow plants and other vegetation along park’s streams, causing erosion damage. But in recent years, resurgent populations of wolves and cougars have restored the park’s natural balance by knocking back elk numbers and changing the herds’ behaviors.

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