Watching a fish glide through water gives the impression that it moves in a world foreign to ours. But if we need air to live, how do these animals manage to breathe beneath the surface, where our ...

When you and I take a deep breath, we pull air into our lungs. That’s because humans are mammals. But fish aren’t mammals. They usually don’t breathe air. They usually don’t have lungs. That’s what I ...

Fish can breathe underwater, that’s sort of their thing. Dissolved oxygen in the water is pulled from the surrounding ocean via their gills, but now experts say one fish is able to actually hold its ...