Agence France-Presse: Polar bears have been spotted eating dolphins in the Arctic for the first time ever by Norwegian scientists, who believe global warming could have caused the bears to expand their diet. Polar bears feed mainly on seals but Jon Aars at the Norwegian Polar Institute has photographed dolphins being devoured by a bear and published his findings in the latest edition of Polar Research this month. "It is likely that new species are appearing in the diet of polar bears due to climate change because new...