Sharks are one of the oldest known creatures of the modern world, dating back to 450 millions years or so and some of the present kinds have been known to be around for about 100 millions of years, the very time when the dinosaurs used to roam our planet. Remarkable aquatic creatures in their own rights, with more than 350 species of its kind, (75 in the list of endangered species), sharks are a wondrous biological entity of our earthly ecosystem with stellar characteristics.