Some swifts returning to Britain to breed will be unable to access their ancestral nesting holes after they were blocked in a £7.5m refurbishment of a Derbyshire railway viaduct, campaigners say. Nature lovers had appealed to Network Rail to unblock three holes which were among at least nine swift nesting sites on the twin viaducts at Chapel Milton, on the edge of the Peak District. Campaigners said Network Rail had been given extensive details of the location of the nest holes, between tiny gaps in the stonework, but three were filled with mortar in February. “It’s utterly heartbreaking,” said Deb
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