Shark Wallpaper

Incredible Shark Photo Gallery - Wallpaper Unique Illustrations - Ocean Art Images Free Download !

Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha and are the sister group to the rays.

Amazing Shark and Predator Pictures HD Wallpapers - Digital Art High Definition !

Fun Facts : Evidence for the existence of sharks dates from the Ordovician period, 450–420 million years ago, before land vertebrates existed and before many plants had colonized the continents.

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