Mammals have a layer of fat under the skin to help insulate the body.
Harbor seals, like sea lions, have evolved to utilize a layer of fat called blubber.
Sea lions have a layer of blubber to insulate the body.
How do sea lions keep warm?
Options:
1) protected
2) warm
3) Swimming fast
4) Sleeping
5) hydration
6) Blubber
7) four limbs
8) Eating a lot of fish