Board Thread:Fun and Games/@comment-32311838-20170822015949/@comment-32311838-20170822035252

Yeah I know I'm real original... but I couldn't find any other good riddles.

Also, it's debatable whether or not they "breathe", as they don't respirate, but instead pass oxygen-rich water through their mouths, and release oxygen-poor water from their gills.

So the water is flowing through them, and the gills just catch oxygen. Not really "breathing", but it IS their only source of oxygen...