All about Sharks with John McCosker | Pottery Barn Kids

All about Sharks with John McCosker | Pottery Barn Kids


Pottery Barn Kids
All About Sharks with
John McCosker Hi I’m John McCosker I’m a Scientist at the California
Academy of Sciences who studies Sharks I want to share with you some of my thoughts with you
Pottery Barn Kids about sharks because I know you
are fascinated by them too. What I love about Sharks is how
graceful they are under water. A shark can be slowly swimming across the bottom
or instantaneously it can rush off at 20 mph. Sharks are very important in the ocean
because they are apex predators
and they are on top of the food chain. and if you don’t have the animal at the top of the
food chain the rest of the food chain is all
out of balance there are more than 400 different kinds of sharks smaller sharks called cigar sharks no larger than that. some sharks are able to live where there is little or
no light at all this is a leopard shark spotted like a leopard
and they of course have shark skin which
is rough like sand paper when you try to rub your fingers forward on
shark skin it just doesn’t move very well and that is because there are millions of little teeth
in their skin called denticles good for defense it also allows them to swim
a little bit faster the sharks are pretty amazing fishes shark teeth are replaced like a conveyor belt
Not only do all sharks have replacement teeth but all shark teeth are slightly different this for example: the tiger shark tooth.
we can see that it has little little serration like
a bread knife because Tiger sharks will eat about anything in the ocean Other sharks have different shape teeth like this Cow shark
tooth. You can’t talk about shark teeth with out talking about
Megalodon the great great uncle of the great white shark We didn’t even exist until many millions of years later. the shark that had this tooth was 17 feet long.
the shark that had this tooth was probably 40 feet long Sometimes I wish I could be scuba diving and look over
and see Megalodon swim by because it would be like a greyhound bus swimming by me the Pottery Barn Kids and I agree sharks are cool.
but sharks need your help. Every year millions of
sharks are hunted just for their fins. So if you want to keep the oceans healthy
so there are sharks in the future tell everyone you know
about sharks and the importance they play on our lives. Care more learn more and enjoy sharks

3 thoughts on “All about Sharks with John McCosker | Pottery Barn Kids

  1. I have been watching this so so so many times . It is awsome! I love sharks as much as you and that is a lot .Next time can you tell us about crocodiles. PLZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ

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