Reintroduction

Hila Shamon with Smithsonian Conservation Biology Institute

Swift foxes are reddish-brown, a bit smaller than a house cat, with big ears and a long tail. They do their best to sound intimidating when they're live-trapped, but they tend to be quite docile. They were historically found across the Great Plains region from Alberta, Canada down through the central part of the United States, but today, they're only in about 40 percent of that area.

Alpha male (712) of the Canyon pack in the Lower Geyser Basin
Jim Peaco / Yellowstone National Park

Aspen trees are making a comeback in Yellowstone National Park, and according to a new study out of Oregon State University, that’s thanks to wolves.