Page last updated at 06:09 GMT, Tuesday, 9 September 2008 07:09 UK

Algae turn polar bears green


Green polar bears have been puzzling visitors to a Japanese zoo.

Three normally white polar bears at Higashiyama Zoo changed their colour after swimming in a pond with an overgrowth of algae.

The bears are expected to return to their natural colour when the algae growth subsides in November.


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