Abilities of the water hunters
Sharks are a very strange and interesting creature, although sharks are classified as fish they are very different from fish and indeed larger. Sharks do not have bones unlike most fish, instead they have cartilage. Cartilage is a fibrous tissue that is quite hard, and it is quite light. Sharks also do not have a swim bladder again unlike other fish , which contains gas that allows the fish to rise up and down vertically or just lets it float. This bladder also allows the fish to rise to the surface quickly without have to swim, and the sharks use their dorsal fins which lift like a airplane's wings. However the fins alone are not enough to rise all the way, what really helps is the shark's liver. The liver is filled with a oil which is lighter than water so this helps the shark float up to the surface more easily. But this does not mean that he can float forever, they have to keep swimming otherwise they will sink to the bottom, because its liver only allows it to move between very deep water and the surface with ease. Continuing on sharks also do not have gill covers which means that they cannot pump water over their gills so they have to move to breath. However the tiger shark which swims with its mouth open is known to store air in its body so it can float motionless in the water, and there is a reason for this, when the tiger shark is tired it will float in a current that is carrying oxygen so it can breath without moving. A sharks hearing is its best long- range sensor, and its ears are located behind the eyes.