My husband and I were contemplating whether to hike the 3-mile trail in Utah’s Zion National Park that September day. I’d read that this trail was our best chance to spot bighorn sheep, but after a week of exploring the five national parks in the state, our bodies were tired—and it was already late...

WASHINGTON—Animal protection and conservation groups sent notice today of their intent to sue the U.S. Fish and Wildlife Service for missing its deadline to decide whether the common hippopotamus should be protected under the U.S. Endangered Species Act. The deadline results from a 2022 petition...