1) Nipples In Your Armpits? Manatees have two nipples, one under each armpit. Watch this video of a manatee calf nursing. 2) The Only Vegetarian Marine Mammal Manatees and dugongs (sirenians) are the only vegetarian marine mammals alive today. A manatee needs to eat 10-15% of its body weight each day. A manatee weighs 800-1200 [...]