Manatee flippers have five digits that are covered by a thick layer of skin. This bone structure is similar to that of toothed whales, seals, and sea lions. E. Hind limbs. Hind limbs are absent. Vestigial pelvic bones, which aren't connected to the vertebral column, are found deep in the pelvic musculature.
Manatees have no externally discernible neck.
Manatees don't have external ear flaps. The opening to the ear canal is very small. Two nostrils lie on top of the head at the end of the snout. Manatees have a large flexible upper lip. Their lips help guide vegetation into their mouth.