Yellowstone’s wolves are back, but they haven’t restored the park’s ecosystem. Here’s why.

From USA Today:

YELLOWSTONE NATIONAL PARK, Wyoming – Yellowstone’s wolves are back, helping revive parts of the ecosystem that changed drastically when this top-of-the-food-chain predator was killed off nearly a century ago. But Yellowstone is still not 100% back to normal – and it may never be.

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