Page last updated at 14:45 GMT, Wednesday, 7 May 2008 15:45 UK

Tagging walruses in the Arctic

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Scientists have been attaching satellite tags to walruses in West Greenland to track their movements.

They want to find out where the tusked beasts migrate to over the summer months - at the moment the creatures simply vanish off the radar.

This footage, filmed during the 2007 expedition, shows the matchbox-sized devices being attached to the walruses' thick skin with a CO2-powered gun.

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