Florida Manatees (IMAGE) U.S. Geological Survey Caption In winter, Florida manatees can be killed by cold water. These natural springs where water temperature is always warmer than 70 degrees Fahrenheit are essential habitat for the subspecies. Credit Photo: USGS Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.