We’re here at the lake to find out how different animals breathe. All animals need to take in oxygen and get rid of carbon dioxide, but they can do this in very different ways. Take fish ...

If you keep pet fish, at some point, you may have encountered an escapee lying lifeless outside the water. Fish jumping out ...

Each time the tide recedes, most fish escape certain death by following the water. But not the prickleback. This uncanny eel-like fish has a trick up its sleeve — it can breathe air.

This species, with its many varieties, is the most common betta fish found in aquariums and pet stores ... bettas have evolved to breathe air at the water’s surface. This ability develops ...