a half eaten carcass and six wolves behind it

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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