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Sharks are fish, but unlike other fish, their skeletons are made of cartilage rather than bone, and instead of smooth, flat scales they have sharp, tooth-like scales called denticles. Scientists believe that sharks are 2... More »

www.reference.com Pets & Animals Marine Life Sharks

The bull shark is one of the few shark species that live both in salt water and freshwater. These sharks can travel far up rivers, swimming as far as 2.220 miles up the Amazon River in Peru and over 1.800 miles up the Mi... More »

www.reference.com Pets & Animals Marine Life Sharks

The megalodon shark grew to be between 45 and 60 feet long and scientists believe it was the largest prehistoric shark to have ever lived. The name "megalodon" means "big tooth" and its teeth grew to be around 7 inches l... More »

www.reference.com Pets & Animals Marine Life Sharks
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Sharks belong to the fish family, and are characterized by having skeletons that are made from cartilage rather than bone, a series of five to seven gill slits located on both sides of their body for respiration purposes... More »

www.reference.com Pets & Animals Marine Life Sharks

A shark's skeleton is composed of cartilage and a network of collagen fibers. This differs from most other vertebrates and allows for the especially efficient attachment of muscles, which results in little waste of mecha... More »

www.reference.com Pets & Animals Marine Life Sharks

Sharks do not have a backbone because their skeletal system is made up of a softer cartilage, just like all the other fish that belong to the Chondrichthyes class. The cartilage found in sharks is not as hard as a real b... More »

www.reference.com Pets & Animals Marine Life Sharks

Sharks have tiny, coarse scales called placoid scales, which reduce drag from the surrounding water. Placoid scales are also known as dermal denticles and structurally resemble teeth. The texture of a shark is similar to... More »

www.reference.com Pets & Animals Marine Life Sharks