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...

Danielle Tepper had always loved dolphins. When she went on vacation to Hawai'i, she knew she had to see them firsthand. Tepper—now a senior editor at the Humane Society of the United States—wanted to do it ethically, so she avoided captive dolphin attractions. Instead, she booked an excursion to...