The northern snakehead is not alone in this ability: Walking catfishes, lungfishes, and betta fish can all breathe air directly as well. These fish reach sexual maturity between one and three ...

Breathing releases another gas, carbon dioxide, which is exhaled by gorillas, humans and fish. Humans inhale oxygen from the air, through the mouth, into the lungs to breathe easily. However ...

While all land-dwelling animals breathe oxygen from the air, fish need oxygen too. Not only this, but fish can run out of oxygen, something we humans don’t need to worry about. Here we’ll look ...

Take fish, for example. Unlike land animals, fish get their oxygen from water, not air. They don’t have lungs to breathe with either, they have gills. Fish gulp water through their mouths and ...