Page last updated at 15:56 GMT, Wednesday, 8 April 2009 16:56 UK

Polar explorer on Arctic foxes

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A trio of polar explorers are trekking to the North Pole in a bid to measure the thickness of the Arctic ice.

They are sending in regular diary entries, videos and audio to BBC News throughout their expedition.

Here, after an encounter with an Arctic fox, Pen Hadow reveals why he thinks they are such extraordinary animals.

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