Manatees are an endangered species of herbivorous, aquatic mammals found primarily in the rivers and estuaries of Florida. As part of its conservation efforts, the Florida Fish and Wildlife Commission records the cause of death for every recovered manatee carcass in its waters. Of the 392 392 recorded manatee deaths in 2012, 68 68 were perinatal and 81 81 were caused by collision with a watercraft.