Family Carcharhinidae (requiem sharks).

The Leopard Shark (Triakis semifascicata) is in the Family of Carcharhinidaes (requiem sharks). Carcharhinidaes are the largest family of sharks in numbers. This family consists of bull sharks, sandbar sharks, tiger sharks, great blue sharks and more. The Leopard shark (Triakis semifascicata) grow to 7 feet and are heavily marked with black crossbars and blotches. Their teeth are short, broad and triangular shaped. The Leopard sharks (Triakis semifascicata) are active, fast sharks. They are nomadic, schooling sharks that roam inshore sand flats and rocky areas. They are known to feed on soles, bivalves, crustaceans, and other small bottom dwelling fish.

Sharks have been around for 400 million years and out of that 400 million years about 100 million years the sharks and their close relatives have been closely unchanged in appearance. There are about 900 species of sharks and their close relatives. There are about 400 species of sharks and more are been found and added to the list.

What makes a shark a shark? First it's skeleton is made of cartilage, which is lighter, tougher, and more flexible than bone.

1. http://www.marinelab.sarasota.fl.us/SHARKS.HTM

4. Eyewitness Encyclopedia of Nature 2.0 Copyright date 1995

The most noticeable difference is its teeth. They're jaw is lined with teeth, acting as a conveyor belt with new teeth replacing the old, broken and lost teeth.

3. The Complete National Geographic 109 years of National Geographic Magazine on CD-ROM

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