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Undated handout photo issued by BAS of Emperor penguins, as some of them are having to struggle up 100ft walls of ice as warmer temperatures force them out of their traditional breeding grounds, a study has shown. The gravity-defying march of the penguins was spotted by British Antarctic Survey scientists in satellite images of four colonies. The birds normally breed on thin sea ice, close to easily accessible food sources. But ice forming later than usual in recent years has compelled them to move to much thicker floating ice shelves. Experts believe the unusual behaviour could indicate that the penguins are adapting to environmental change. (Photo by BAS/DigitalGlobal/PA Wire)
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