Well over 350 species of sharks are known to science, and they can be found in all the world's oceans from Polar Regions to the equator and from the surface to the deepest ocean trenches. Here is a concise and informative introduction to the shark with details of its anatomy and senses, its hunting and feeding behavior, its reproduction and life cycle. The gaping jaws, rows of sharp teeth, and the triangular fin slicing through water are familiar characteristics of the shark family.