Some Florida lawmakers want manatees back on the endangered species list. Last month, the U.S. Fish and Wildlife Service announced that the large marine mammal was now considered “threatened” instead of “endangered” because its population had increased  to an estimated 6,620 manatees in Florida. Hoever, 11 representatives from Florida from both parties have signed a letter to Interior Secretary Ryan Zinke last week, asking him to overturn that decision. The letter said the wildlife service’s decision was potentially harmful to the survival of the iconic Florida animal. It also said state and local officials could consider weakening manatee protections such as slow-speed boating zones because of the wildlife service’s decision.