Sharks
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Hundreds of sharks spotted off Australian coast

3 September 2010 Last updated at 09:07 BST

Hundreds of sharks have been spotted off the Queensland coast in Australia.

Lifeguards are on the lookout for the huge school of the predators, filmed feeding on bait fish and tuna by a rescue helicopter.

Some are thought to be tiger sharks, which are about 15ft (4.5m) long.