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Wikipedia: Sharks are a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 420 million years ago, before the time of the dinosaurs. Since that time, sharks have diversified into 440 species, ranging in size from the small dwarf lanternshark, Etmopterus perryi, a deep sea species of only 17 centimetres (7 in) in length, to the whale shark, Rhincodon typus, the largest fish, which reaches approximately 12 metres (39 ft) and which feeds only on plankton, squid, and small fish through filter feeding.
![[A Port Jackson shark's egg case]](http://images.ookaboo.com/photo/s/PortJacksonShark_27sEgg20050417c_s.jpg "A Port Jackson shark's egg case")
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![[The teeth of the tiger shark are oblique and serrated for sawing through flesh.]](http://images.ookaboo.com/photo/s/Tiger_shark_teeth_s.jpg "The teeth of the tiger shark are oblique and serrated for sawing through flesh.")
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 from :en:Golden Wattle |
 from Stefan Kühn |
![[Photo of shark fin soup in bowl with Chinese spoon]](http://images.ookaboo.com/photo/s/Sharksfin_s.jpg "Photo of shark fin soup in bowl with Chinese spoon")
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![[Collecting fossilized shark's teeth is an easy way to begin collecting fossils]](http://images.ookaboo.com/photo/s/Sharksteeth_castlehain_s.jpg "Collecting fossilized shark's teeth is an easy way to begin collecting fossils")
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 from Arthur Hungry |
from Debivort |
![[Photo of shark hung by its tail on the shore]](http://images.ookaboo.com/photo/s/Tiger_shark_2C_Hawaii_Aii_s.jpg "Photo of shark hung by its tail on the shore")
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from Walterince |
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