The recent cold weather has been tough on manatees in Florida.
On Thursday, a 350-pound manatee named Pigpen was taken to the Miami Seaquarium.
He's suffering from cold shock, caused by the frigid temperatures to hit south Florida this month. Cold shock can shut down a manatee's internal systems long before external signs appear.
Nearly 2,000 manatees swam to south Florida recently in search of warmer water.