From The American Prospect:
In the summer of 2014, two young gray wolves in eastern Oregon dispersed from their natal packs—one from the Snake River Pack and the other from the Minam Pack—and paired up. The Oregon Department of Fish and Wildlife (ODFW) had already radio-collared both and tracked them as they traversed the Eagle Cap Wilderness in the northeastern corner of the state.
That year, Oregon had 81 known wolves. While the state was seeing the population rebound after being extirpated in the mid-1940s, that number was far less than the estimated 1,450 wolves that the mountain wilderness could support. The following year, the wolf pair produced two pups that survived. The Catherine Pack grew over the years as eight more pups survived—until last winter.