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Peter Marren is a wildlife writer based in Wiltshire. His fascination with butterflies began when he was a child: he still remembers catching a Painted Lady in his hands at the age of five and it transferring some of its colours onto his palm. Rainbow dust, he dubbed it. 'It was a Nabokov moment because only he could put into words what most of us can only feel: the frankly sensual moment in a child's life when the full force of nature is felt for the first time.'