Peter the Wild Boy was a boy from Hanover in northern Germany who was found in 1725 living wild in the woods near Hamelin , the town of Pied Piper legend. The boy, of unknown parentage, had been living an entirely feral existence for an unknown length of time, surviving by eating forest flora he walked on all fours, exhibited uncivilized behaviour and could not be taught to speak a language. He is now believed to have suffered from the very rare genetic disorder PittHopkins Syndrome.
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Source: Wikipedia