Polar Hydrosnapper

The polar hydrosnapper replaced its ancestor the marine hydrosnapper. Due to the ice age it had to adapt to the cold polar environment. Being cold-blooded many died out however some developed a primitive fold of warm-bloodeness by maintaining a higher body temperature than the surrounding water. A strip of aerobic red muscle located near the center of the body generates the heat, which the body retains via a counter-current exchange mechanism by a system of blood vessels. This allows them to keep active even in cold waters. In addition their darker coloration, larger body and thick blubber helps retain heat as well. Their fatter shape is more streamlined and their tail-membrane has become more like a tail-fin. Their legs have atrophied a bit since they do not need to use them to swim anymore. Their shell too has become more of a dorsal fin shape to help in stability. Their gray coloration also helps them blend into the gray sands of Jujubee Polar Sea. Like their ancestor they are ambush predators that sit and wait for prey to come to them to help retain energy. Still air breathers, they must also come to the surface to breathe from time to time. They have become ovoviviparous to keep their eggs warm inside their bodies until they are ready to give birth to them. They are mostly solitary creatures who only met to mate.