How do sea otters breathe under water?
... Sea otters don't breathe under water. The only animals that can are ones that have gills. Sea otters can hold their breath for long periods of time but must come up eventually (sort of like dolphins, whales, penguins etc.) They don't breathe underwater, they are mammals, that means they are like us, they breathe air. They might seem like they can breathe underwater, but the truth is, they have to come up once in a while to get some more oxygen. ...
How is sea otters fur adapted for living under water?
One way is that their fur is really dense to keep the warmth in.
Asked in Dolphins and Porpoises
Can dolphins breathe air above water or do they have to breathe under water?
No mammals can breathe underwater. All mammals, including sea mammals, must breathe above the surface of the water. This is why marine mammals such as dolphins and whales frequently come to the surface. ...