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Scotland's ospreys have started their epic Autumn flight to West Africa. A team of conservationists headed up by biologist Sacha Dench is following them all the way, aiming to discover much more about the journey that the ospreys make and the challenges they face along the way. Climate change is making weather patterns less predictable, crucial wetlands on their route are being poisoned by pesticides and depleted by drought and the birds have the unfortunate habit of electrocuting themselves when they land on powerlines with freshly caught fish. Today, the Conservation Without Borders team choose which of the British birds they'll follow on their epic journey. They'll be stopping at key osprey breeding sites in Mid Wales, Rutland and at Poole on the south coast, before Sacha and the ospreys tackle the crossing of the English Channel. Producers: Emily Knight and Alasdair Cross