Shark

Sharks are groups of cartilaginous fish, hydrodynamic bodies easily turn water, there are 5 to 7 gill slots along each side or near the head (the first slot behind the eyes is called breathing holes), the skin has many small spines. Covering the body against parasites, the rows of teeth in the mouth can grow back. Sharks include species of size just by hand to giant whale sharks.

Warm sea can pull sharks to Antarctica: Potentially serious consequences