A Whale - in London !

A seven-tonne whale has made its way up the Thames to central London, where it is being watched by riverside crowds.
The 16-18ft (5m) northern bottle-nosed whale, which is usually found in deep sea waters, has been seen as far upstream as Chelsea.
A rescue boat has been sent to protect the whale and rescuers have been trying to keep it away from the river banks.

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