From Rolling Stone:
In February 2021, a black wolf wandered across the border of Yellowstone National Park in Montana. Called 1155, he wore a radio collar that park biologists fit him with three years before. When he left the safety of the park, 1155 was what biologists call a “dispersed male,” leaving his pack to travel alone in search of a mate. As a descendant of wolves reintroduced in 1995 to Yellowstone and Idaho’s Frank Church-River of No Return wilderness, he was playing out a role in a success story three decades in the making: to ultimately restore wolves to their former range from which they’d been exterminated.