Nineteen strangers huddled together, smiling for a group photo. Many had only met that day. But they’d come together for one mission: to rescue over 700 wild animals from a Puerto Rican zoo—closed to the public since hurricanes battered the island in 2017—and a government-run detention center used...

You’d think it would be easy to persuade people to protect prairie dogs: Not only are they a keystone species, with nine other species directly dependent on them for survival, but they’re also irresistibly cute, with big eyes and big personalities. Yet the personable little rodents often find...