In observance of Manatee Awareness Month, we"re swimming through clear, aquifer-fed spring waters in Florida with two friendly "sea cows." Generally solitary animals, manatees are also known to be curious and will approach boats. That"s why Florida enforces special speed zones for watercraft, particularly as the manatees are on the move to warmer areas to spend the winter. While manatees have no known natural predators, they remain a vulnerable species due to loss of habitat and collisions with boats. These two have arrived in Three Sisters Springs, a natural freshwater spring system in the Crystal River National Wildlife Refuge on the west coast of the Florida Peninsula. The refuge protects critical habitat for the hundreds of manatees that migrate here each winter.