The "Souls of the Dead" are back again, arriving in time for All Saints (El Dia de los Muertos) every year. Orange butterfly clouds dance around the indigenous making their pilgrimage to the cemetery. The Monarch butterflies have come to spend the winter here. It is many millions of them. They just have been through a long and dangerous journey. On the highway of winds they flew 3,000 miles straight across the USA. The story of ...moretheir journey starts two months ago at the Great Lakes. On the road the American natural history writer and Monarch-scientist Robert Michael Pyle (Chasing Monarchs) follows their way to the South. But are the "Souls of the Dead" really immortal? Every year the journey gets more and more dangerous for the sensitive butterflies. They are too fragile to cope with mankind's challenges and could become a symbol: fort the threats of global environmental problems like GM crop or climate change... ...hide