25 years after returning to Yellowstone, wolves have helped stabilize the ecosystem

New research shows that by reducing populations and thinning out weak and sick animals, wolves have a role in creating resilient elk herds.

Wolves and black-billed magpies scavenge at a dump where carcasses are stored in Yellowstone National Park.
Photograph by MICHAEL NICHOLS WITH RONAN DONOVAN AND THE NATIONAL PARK SERVICE

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