![Picture](/uploads/8/0/9/9/80993216/6150163.jpg?1464189730)
Things to know about Marine Mammals
- They are endothermic/ warm blooded
- Placental development, live births
- Use lungs to breathe air
- Fed mild by mother
- Well cared for
- They have hair on their skin to retain heat
- Thick layer of fat/ blubber
![Picture](/uploads/8/0/9/9/80993216/5284706.jpg?1464189770)
There are major groups of marine mammals: Pinnipedia, Carnivora, Sirenia, Cetacea.
Specifically, Polar Bears fall into the Carnivora category.