Polar bears turn green

Green polar bears are puzzling visitors at a Japanese zoo.

Three normally white polar bears at Higashiyama Zoo and Botanical Gardens in central Japan changed their colour in July after swimming in a pond with an overgrowth of algae.

High temperatures in July and August and less-frequent water changes because of the zoo's conservation efforts caused an algae growth in the bear pond and safety moat. The bears are expected to return to their natural colour when the algae growth subsides in November.

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