1.29 Manatee deaths. 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. Here is a breakdown of the dead manatee counts in Florida for 2012, by cause of death: Manatees Cause of death recovered Watercraft collisions 81 Perinatal 68 Natural 65 Cold stress 28 Flood gate/canal 11 lock K Other human 9 Undetermined Total 392 1. [10] What are the individuals and what is the variable in this story? 2.[5] Most mortalities recorded as "Undetermined" correspond to manatee carcasses too badly decomposed to make any determination as to the cause of death. How many manatee carcasses had an "undetermined" cause of death