How do sea snakes breathe if they spend so much time in the ocean?
Quick Answer
Sea snakes still breathe air with lungs, so they must surface regularly. Some species can stay underwater longer by slowing their metabolism and absorbing oxygen through their skin to a limited extent.
The Full Story
Despite living almost entirely in marine habitats, sea snakes are reptiles and therefore breathe air. They come to the surface to inhale through nostrils that can be closed when underwater. Many species can remain submerged for extended periods because they have efficient oxygen use and can slow their metabolism. Some also absorb a small amount of oxygen through the skin, which helps them during dives, but they still cannot breathe underwater like fish.
Key Facts
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