When they are absolutely developed, manatees weigh 800 to 1,200 kilos (360-545 kilograms) and achieve 10 feet (3 meters) in size. The premier of the species can improve to be up to 3,500 lbs . (1,590 kilograms) and 13 ft (4 meters) in size. Their difficult pores and skin is wrinkled, and their dimension is no joke: They're about 4 to 4.5 feet (1.2 to 1.4 meters) extensive at delivery and common 60-70 pounds (27 to 32 kilograms). Friends die.