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Sharks
Temporal range: Silurian-present
420 mya to present
Grey reef shark
Grey reef shark
(Carcharhinus amblyrhynchos)
Scientific classification
Orders

Carcharhiniformes
Heterodontiformes
Hexanchiformes
Lamniformes
Orectolobiformes
Pristiophoriformes
Squaliformes
Squatiniformes

Sharks are a superorder of fish, the Selachimorpha. They, like other Chondrichthyes, have skeletons made of cartilage instead of bone. Cartilage is tough, rubbery material which is less rigid than bone. Cartilaginous fish also include skates and rays.

There are more than 350 different kinds of sharks, such as the great white and whale sharks. Fossils show that sharks have been around for 420 million years, since the early Silurian. view more...


 KidzTube            
Tiger Shark Vs. Hammerhead Shark

Tiger Shark Vs. Hammerhead Shark
360 Great Hammerhead Shark Encounter | National Geographic

360 Great Hammerhead Shark Encounter | National Geographic
What If There Were No Sharks

What If There Were No Sharks
Arnold VS Megalodon Shark

Arnold VS Megalodon Shark
more videos...