Fish gills are shaped like a heart. Not moving water back and forth, as we do with the air we breathe, saves fish considerable energy. The average fish uses muscles to pump water into its mouth and ...

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 ...

Everybody who has ever bought a fish knows that you are supposed to look for bright eyes, red gills and firm, shiny flesh. And everybody who has ever bought a fish in Los Angeles knows that this ...

I think the gills allow fish to breathe because water goes in them. Because they have holes in their gills so it is like a nose. But I don’t know how they stay alive if we can’t with our nose. Well if ...

A collaborative team of scientists recently found that there is no physiological evidence supporting a leading theory -- which involves the surface area of fish gills -- as to why many fish species ...

Why do you think giraffes have such long necks? It’s a question that has perplexed scientists for years. Do you think giraffes have long necks to reach food in high places? Maybe you are onto ...