marinemammal
nounUK /ˈmær.iːn ˈmæm.əl/
US /məˈriːn ˈmæm.əl/
A marine mammal is a warm-blooded animal that lives in the sea and breathes air.
The dolphin is a marine mammal that swims in the ocean.
OTHER MEANINGS
2. A sea animal that feeds its babies milk.
A mother whale is a marine mammal that feeds her calf milk.
3. A warm-blooded sea creature with lungs instead of gills.
Seals are marine mammals, so they must come up to breathe.
4. An ocean animal that has hair or fur and a backbone.
Sea otters are marine mammals covered in thick fur.