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2:20

Download Shark Teeth | SHARK ACADEMY mp4 download free video

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! www blueworldtv com shop You can join us on Facebook! s www facebook com BlueWorldTV Twitter s twitter com BlueWorld_TV Instagram @blueworldtv Web 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 life

1:50

Download Whitetip Reef Sharks | SHARK ACADEMY mp4 download free video

In this episode of Shark Academy, Jonathan introduces the Whitetip Reef shark! ********************************************************************** If you like Shark Academy, don t forget to subscribe! You can buy some Blue World T-shirts & Swag! www blueworldtv com shop You can join us on Facebook! s www facebook com BlueWorldTV Twitter s twitter com BlueWorld_TV Instagram @blueworldtv Web www blueworldTV com ********************************************************************** It s one of the most common sharks in the world, but it doesn t seem to do much I m Jonathan Bird and this is Shark Academy! The Whitetip Reef shark is a small shark, common on Pacific reefs, not usually getting much bigger than 5 feet long The common name “White tip” comes from very obvious white coloration on tips of dorsal fin and tail The Whitetip Reef Shark’s scientific name Triaenodon obesus means "Fat Trident-toothed" shark A close-up look at the teeth will reveal where the "trident" reference comes from The shark s teeth each actually have three points like Neptune’s trident The Whitetip Reef shark is one of those sharks that can rest on the bottom and gulp water to breathe It does not need to keep swimming to breathe Typically the Whitetip Reef shark is much more active at night On an island called Cocos in the Pacific, the Whitetip Reef sharks have learned to hunt by following divers’ lights And so on a night dive I was able to watch a whole bunch of Whitetip Reef sharks devouring

2:39

Download Shark Attacks | SHARK ACADEMY mp4 download free video

In this fun and enlightening video, Jonathan Bird talks about shark attacks! How likely are you to be attacked by a shark? Are sharks statistically dangerous? Find out more than you ever needed to know about shark attacks! ********************************************************************** If you like Shark Academy, don t forget to subscribe! You can buy some Blue World T-shirts & Swag! www blueworldtv com shop You can join us on Facebook! s www facebook com BlueWorldTV Twitter s twitter com BlueWorld_TV Instagram @blueworldtv Web www blueworldTV com ********************************************************************** How common are shark attacks and what are the chances of being attacked by a shark? I’m Jonathan Bird, and this is Shark Academy! You are 75 times more likely to drown at the beach than to be killed by a shark And…for every human killed by sharks, about 25 million sharks are killed by humans It hardly seems fair for us to be afraid of them In an average year in the USA, there are only about 16 shark attacks, and most are not fatal On the other hand, 41 people a year are killed by lightning in the USA! Nevermind what this tells us about people standing outside in the rain, it means sharks just aren’t that dangerous In fact, 15,000 people are killed each year in bicycle accidents in the USA So just to put it in perspective, let’s look at 20 things around the world that kill more people every year than sharks Traffic, falling coconuts, high school sports, champagne corks, tripping, choking on food, bacteria from raw meat, cows Seriously Wind, bee stings, horses, cold weather, falling from ladders, hot tap water Seriously , ants, dogs, falling icicles, Hippos I couldn’t make this stuff up Lightning, vending machines, jellyfish, and even falling out of bed (not kidding!) And the most dangerous animal to humans? This the malaria-carrying mosquito, which is responsible for 800,000 human deaths every year So next time you are worried about sharks, don’t be Watch out for sneaky vending mach

3:51

Download Shark Reproduction | SHARK ACADEMY mp4 download free video

In this great educational segment, Jonathan explores the reproductive strategies of sharks, explaining how some sharks lay eggs (oviparity), produce live young (viviparity) or produce eggs that develop internally (ovoviviparity) ********************************************************************** If you like Jonathan Bird s Blue World, don t forget to subscribe! You can buy some Blue World T-shirts & Swag! www blueworldtv com shop You can join us on Facebook! s www facebook com BlueWorldTV Twitter s twitter com BlueWorld_TV Instagram @blueworldtv Web www blueworldTV com ********************************************************************** Are they born from eggs or live born? Or both? How do sharks reproduce? I’m Jonathan Bird and this is shark academy! Unlike fish, which produce large amounts of eggs, most of which never reach maturity, sharks produce far fewer, but larger, offspring, and they have a much better chance of reaching adulthood Sharks can reproduce in several ways Many small sharks, like the horn shark, the swell shark and cat sharks actually lay eggs on the bottom The baby shark develops in there, living off a yolk sac filled with nutrients The baby, a miniature version of its parents, is born after a few months to a year of gestation, depending on water temperature and the species Sharks using this reproductive strategy are called oviparous Meaning egg-laying Other sharks are viviparous They give birth to live young which develop inside the mother shark, receiving nutrients and oxygen from mom through an umbilical cord, just like humans Larger sharks like Blue sharks, Bull sharks and Hammerheads use this technique The last group of sharks are ovoviparous, (also known as Aplacental Yolk Sac Viviparous) In this system, the mother produces eggs like the oviparous system, but instead of laying her eggs on the bottom, she carries them inside her body until they hatch When the babies pop out, you might think the shark was viviparous, but the babies had no umbilical cord inside, they lived off a yolk sac In the weird category, the Sand Tiger shark has a strange variation on its ovoviviparous reproduction known as intrauterine cannibalism The mother produces up to 50 pups in each of two uteruses, but the first baby in each uterus that reaches about 4" long eats all its siblings! After 12 months of gestation, the mother then gives birth to a pair of 3 foot long pups! Pups that are well fed! Because sharks put so much more time, effort and energy into producing a viable offspring than bony fish do, they give birth to far fewer pups A whale shark produces the most pups of any shark—around 300 at a time—but then again, mom is the size of a bus The Thresher and Sand Tiger only produce two pups at a time The Blue shark can produce 135 at a time, which is a lot for a shark not the size of a bus Gestation is long too, averaging 9-12 months Baby Spiny Dogfish take 22 months—almost two years—for their young to develop Most sharks take quite a while to become mature enough to reproduce as well Great Hammerheads take 9 years Lemon and Bull sharks take 15 years Spiny Dogfish? 20 years So, between the small litters, a long gestation period and long time to reach maturity, sharks just don’t reproduce very quickly This is the reason they are so vulnerable to overfishing If you’re interested in sharks, there are more than 30 Shark Academy episodes to watch! You can also join my underwater adventures on Jonathan Bird’s Blue World! And don’t ever miss a new episode--subscribe

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