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In the shark aquarium, David explained that sharks are not as easy to treat as dolphins, which can be trained to come to him and be co-operative.
Luckily, they're fairly hardy animals and don't need that much treatment, but the baby sharks often do. And to do that, they've got to be taken out of the aquarium.
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The reason they have to be taken out of the main aquarium and put into a nursery tark is that these sand tiger sharks are highly cannibalistic, and they attack and eat sharks that are smaller than themselves - even the babies!
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So, the Marine Land team catch the babies just after they're born.
They're then kept in the nursery tank until they've grown big enough to not become a tasty snack for a bigger shark.
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Stephen steadied the net whilst John caught one of the sharks so that David could take a close-up look.
The power of even that tiny shark was easy to see from the way it ferociously tried to wriggle free.
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John explained to Stephen that the adult sharks are even more deadly. To keep them used to a human presence, the staff at Marine Land swim with them little and often so that when they do have to go in to remove a baby shark, the adults aren't surprised.
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Gail found further proof of the fearsome power of the shark in the shape of some marks on the water-side of the glass, made by a 2m long sand tiger shark which was chasing a baby.
The baby got away, but the force of the shark ramming into the unscratchable plastic, caused the 8mm thick grazes!
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Stephen rounded the day off by helping out with feeding the sharks.
He even hand-fed a friendly stingray!
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