The San Diego Zoo does not have dolphins in its collection.
Hunting, pollution, and human development along coastlines and rivers have seriously impacted some dolphin populations. Dams, habitat loss, and fishing nets are also hurting dolphins. In 2000, many countries joined the International Dolphin Conservation Program, which is an international agreement to reduce the numbers of dolphins that are lost through tuna fishing. The Hector's dolphin Cephalorhynchus hectori is endangered. Some, like the bottlenose dolphin Tursiops truncatus, are protected in US waters by the Marine Mammal Protection Act of 1972.