Page last updated at 08:44 GMT, Tuesday, 30 September 2008 09:44 UK

How to test a bear's hearing


Scientists in California are testing the hearing of polar bears to try to find out whether the noises associated with melting Arctic ice could affect their ability to survive.

The BBC's Peter Bowes goes to SeaWorld in San Diego to meet Charly, a 12-year-old polar bear taking part in the experiment - and his trainer Mike Price.

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