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Shark Teeth | SHARK ACADEMY 9 лет назад


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Shark Teeth | SHARK ACADEMY

In this informative Shark Academy episode, Jonathan Bird explores the different kinds of teeth that sharks have and what they are used for. ********************************************************************** If you like Jonathan Bird's Blue World, don't forget to subscribe! You can buy some Blue World T-shirts & Swag! http://www.blueworldtv.com/shop You can join us on Facebook!   / blueworldtv   Twitter   / blueworld_tv   Instagram @blueworldtv Web: http://www.blueworldTV.com ********************************************************************** Why do sharks have different kinds of teeth, and why do they have so many? I'm Jonathan Bird and this is Shark Academy! Different sharks feed on different things, and so shark teeth have evolved along with sharks. Small bottom-dwelling sharks that feed mostly on invertebrates have flattened teeth for crushing. Sharks that feed on fish typically have pointy teeth designed to grab and hold slippery prey so it can't get away, and the prey is swallowed whole. The Mako and Sand Tiger shark have these kind of teeth. Sharks that feed on larger animals have more saw-shaped teeth designed for taking bites out of larger prey. The white shark, Bull shark and Reef sharks have teeth like this. The most extreme example of a cutting tooth is the fossilized tooth of the extinct Megalodon shark, kind of like a prehistoric Great White that was larger than any shark alive today, including the whale shark. The Megalodon had the biggest teeth of any shark known. This is a set of jaws from a Bull shark and in the front you can see the active row of teeth that the shark was using, but if you look in the back, you can see, like a conveyor belt, there’s a steady supply of replacement teeth ready to go as soon as one of those front teeth would break off or fall out. So the shark had essentially an unending supply of teeth. In this way, sharks never run out of teeth and they don't need to go to a dentist! It's estimated that some sharks go through 35,000 teeth in a lifetime!

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