The Case Against Marine Mammals in Captivity was first produced in 1995 as a comprehensive resource for the public, the media, scientists, students, and policymakers to learn the various arguments against holding marine mammals for public display in zoos, aquaria, and marine theme parks. Marine mammals cannot thrive in confinement. Marine mammals, but especially the larger, wide-ranging predators such as whales, dolphins, and polar bears, simply do not belong in captivity.