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 indeed suffocate, despite living in water. Their gills, vital for extracting oxygen, require a constant flow of ...

Every other Friday, the Outside/In team answers one listener question about the natural world. This week, Monica in West Hartford, CT asked, “We’ve all heard the phrase, ‘take a deep breath,’ and ...

Most people assume that fish are perfectly safe underwater and that drowning is impossible for them. After all, they are uniquely designed for life beneath the surface. But the idea that fish cannot ...