Capturing the photographic 'sweet spot'

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British amateur photographer, Nima Sarikhani, won the Wildlife Photographer of the Year People's Choice Award. He captured this stunning photograph of a polar bear off Norway's Svalbard archipelago. Richard Sabin, the curator of mammals at the Natural History Museum, and a judge on the panel for the award, tells us what makes this year's winning photo so astonishing. Produced by Lucy Acheson. (Image: Wildlife Photographer of the Year People's Choice Award/PA)