
Manatees in Florida's Crystal River gather by the hundreds each winter around freshwater springs that stay at a constant 72 degrees Fahrenheit, a thermal refuge that protects them from potentially fatal cold stress when Gulf water falls below 68 degrees
Every winter, hundreds of Florida manatees crowd into Crystal River's freshwater springs, where water flowing from the Floridan aquifer holds a constant 72 degrees. The margin between survival and cold stress is only four or five degrees, and the springs are what keeps them alive.















