DVD Available at: Gentle giants are lurking at the bottom of some of the most affluent gardens in Florida. Manatees are large aquatic mammals that share the same ancestry as elephants – they’re not well known world wide, but they’re a household name in Crystal River, Florida. Every year hundreds of manatees journey north to spend the winter in Crystal River’s many canals where natural hot springs provide a lifeline. Their charm and gentle nature has endeared them to the locals, but there are hidden dangers in living so close to humans. A killer that attacks with mechanical precision takes about 80 Florida manatees every year. Who or what is killing these gentle giants and what can be done to stop them?