As different as a man may be from a fish, both life forms share some similarities in basic structure and functions. Man and fish share such organs as the brain, stomach, liver, and kidneys. Other organs appear in different forms in different organisms; for example, the lungs in humans and the gills in fish are very different but both provide the same basic function of respiration. Finally, some organs are simply not present in man, such as the fish's swim bladder. The following illustration of a Ocellaris Clownfish (Amphiprion ocellaris) shows some of the common internal features of the fish.