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SharksSharks

SharksSharks ( (Selachimorpha) Selachimorpha) The earliest The earliest known sharks date back far as known sharks date back far as 420 million years ago. That’s 420 million years ago. That’s before the Dinosaurs.before the Dinosaurs.•Sharks were called “sea Dogs” Sharks were called “sea Dogs” by sailors until the 16by sailors until the 16thth century. century.•The name Shark was first used The name Shark was first used by Sir John Hawkins when he by Sir John Hawkins when he exhibited a specimen in London exhibited a specimen in London in 1569.in 1569.

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Sharks TeethSharks Teeth

• Sharks have the most powerful Sharks have the most powerful jaws on the planet.jaws on the planet.

• Unlike most animals jaws, both Unlike most animals jaws, both the sharks upper and lower jaws the sharks upper and lower jaws move.move.

• Sharks have 5 to 15 rows of teeth Sharks have 5 to 15 rows of teeth in each jawin each jaw..

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Dinner TimeDinner Time

• UsuallyUsually Sharks eat alone.Sharks eat alone.

• But sometimes one feeding shark But sometimes one feeding shark attracts others .attracts others .

• They will bite at almost anything that They will bite at almost anything that gets in their way – even each other.gets in their way – even each other.

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Gentle GiantsGentle Giants

• Not all sharks are carnivoresNot all sharks are carnivores

• Funny as it may sound the most Funny as it may sound the most harmless sharks tend to be the harmless sharks tend to be the biggest.biggest.

• They are the WhaleThey are the Whale Shark, Basking Shark, Basking Shark, Megamouth Shark.Shark, Megamouth Shark.

• They all have aThey all have a diet of shrimp and diet of shrimp and plankton.plankton.

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Dangerous PredatorsDangerous Predators

• The Great WhiteThe Great White,, Tiger, Hammerhead, Mako and Tiger, Hammerhead, Mako and the Bull Shark are the biggest Predators.the Bull Shark are the biggest Predators.

• About 100 shark attacks each year.About 100 shark attacks each year.

• 10 10 resultresult in human deaths. in human deaths.

• In perspective people kill thousands of sharks in In perspective people kill thousands of sharks in one year .one year .

• For instance Shark Fin Soup Shark Steaks.For instance Shark Fin Soup Shark Steaks.

• The most popular shark in the U.S.A is the Mako.The most popular shark in the U.S.A is the Mako.

• Now who is the most dangerous predatorNow who is the most dangerous predator ??

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Super sensesSuper senses

• Why are Sharks so successful Predators?Why are Sharks so successful Predators?

• A Shark uses two – thirds of its brain for its A Shark uses two – thirds of its brain for its senses :- smell.senses :- smell.

• They feel vibrations in the water by using a They feel vibrations in the water by using a line of canals that go from the head to the line of canals that go from the head to the tail.tail.

• Called a “lateral line”.Called a “lateral line”.

• They also have a sensory organ known has They also have a sensory organ known has the “the “AmpullaeAmpullae of of Lorenzini”.Lorenzini”.

• Ampullae detects the electric field of its prey.Ampullae detects the electric field of its prey.

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A few less known SharksA few less known Sharks

• The Sand Tiger SharkThe Sand Tiger Shark

• 10 feet long.10 feet long.

• Hunts at night.Hunts at night.

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Wobbegong SharkWobbegong Shark

• Grows about 8 feet long (2.4mths).Grows about 8 feet long (2.4mths).

• Lies at the bottom of the sea.Lies at the bottom of the sea.

• It has a worm like projections on its head It has a worm like projections on its head to attract its preyto attract its prey

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Zebra SharkZebra Shark

• You can keep this gentle small shark in You can keep this gentle small shark in aquariums.aquariums.

• The tail of this shark is half its length of its The tail of this shark is half its length of its body.body.

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Shark sizesShark sizes

0

5

10

15

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25

Tiger SharkHammerhead SharkBull SharkGreat White Shark

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The endThe end•Well I hope you Well I hope you have enjoyed my have enjoyed my slides show on slides show on Sharks.Sharks.•I would like to I would like to take a couple of take a couple of minutes more of minutes more of your time to your time to watch a short watch a short video.video.

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SourcesSourceshttp://http://www.kidzone.ws/sharks/index.htmwww.kidzone.ws/sharks/index.htmhttp://www.flickr.com/photos/johnpamowens/83293http://www.flickr.com/photos/johnpamowens/83293310/sizes/s310/sizes/shttp://search.creativecommons.org/?http://search.creativecommons.org/?q=great+white+shark&sourceid=Mozilla-searchq=great+white+shark&sourceid=Mozilla-searchhttp://http://search.creativecommons.org/?qsearch.creativecommons.org/?q==sand+tiger+shark&sourceidsand+tiger+shark&sourceid=Mozilla-search#=Mozilla-search#

http://www.flickr.com/photos/rling/3246660564http://www.flickr.com/photos/rling/3246660564http://http://en.wikipedia.orgen.wikipedia.org/wiki/Sharks/wiki/Sharks http://http://search.creativecommons.org/?qsearch.creativecommons.org/?q==sharks&sourceidsharks&sourceid=Mozilla-search=Mozilla-search