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...

Humans are fascinated by the intelligent and gregarious nature of the dolphin. As one consequence of this fascination, dolphins are commercially exploited in marine parks, aquaria and "swim-with-the-dolphins" (SWTD) attractions worldwide. In the United States, the Department of Commerce's National...