In this Sept. 26, 2018, file photo, provided by the National Park Service, a 4-year-old female gray wolf emerges from her cage as it is released at Isle Royale National Park in Michigan. Wolf pups have been spotted again on Isle Royale, a hopeful sign in the effort to rebuild the predator species' population at the Lake Superior national park, scientists said Monday, July 12, 2021. (National Park Service via AP, File)

July 12, 2021