What kinds of wolves live in Yellowstone National Park?

The wolf species that inhabits Yellowstone National Park is Canis lupus irremotus, commonly known as the Northern Rocky Mountain wolf. This subspecies of the gray wolf (Canis lupus) was reintroduced to the park in 1995 and 1996 after wolf populations had been nearly eliminated from Yellowstone and surrounding areas due to human persecution in the early 20th century.