Spinners congregate in superpods of hundreds, coordinating a hunt - and spinning! Scientists do not know for certain why they spin.

Eight-year-old Thomas was born with a rare genetic disorder, which resulted in a lot of trouble communicating with his parents. Now, Thomas undergoes dolphin therapy in the Florida Keys.

Human lives have been influenced by animals in matters that reach far beyond the food chain. In surprising ways, animals help teach, heal, and strengthen people -- in body, mind, and spirit.

After the Nicaraguan government finds out that two dolphins have been captured for a "swim-with" program at a resort hotel, rescuers are dispatched to track them down.

Filmmaker Hardy Jones used his camera as a tool for conservation, filming dramatic dolphin hunts and documenting the effects of chemical pollution on dolphins and orcas.

Hardy Jones, the filmmaker behind NATURE's "The Dolphin Defender," is a former journalist with CBS News and UPI. NATURE Online interviewed him in May 2005.

For decades, Hardy Jones has been working to expose and stop the trade in dolphins used for food and entertainment. In some cases, Jones's footage has helped stop dolphin captures.

Dolphins use sound to detect the size, shape, and speed of objects hundreds of yards away. The dolphin's natural sonar, called echolocation, is incredibly precise

Chemical pollution, including pollution from polychlorinated biphenyls (PCBs), has been linked to health and reproductive problems in dolphins and orcas.

View additional resources, online and in print, for NATURE's "The Dolphin Defender."