Can "Rewilding" Restore Vanishing Ecosystems?

Wolves were once native to the Yellowstone National Park until hunting wiped them out. But when, in 1995, the wolves began to come back, something interesting happened: the rest of the park began to find a new, more healthful balance.

Source: http://www.npr.org/2013/09/27/225426662/can-rewilding-restore-vanishing-ecosystems?ft=1&f=1007

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