The dugong spends up to eight hours a day grazing on seagrass meadows, earning it the nickname "sea cow." Unlike the manatee, it has a crescent-shaped tail similar to a whale's.
What defines this group — Marine mammals
Warm-blooded, they nurse their young and breathe air — the group closest to us underwater.
They breathe through a blowhole (whales, dolphins) or nostrils (seals, sea lions).
A thick layer of blubber, rather than fur, insulates them from the cold.
Many navigate and hunt by sound, using echolocation.