BBC: But with freezing temperatures affecting much of Britain and northern Europe, those who do fly south hoping to find some ice-free conditions could be out of luck, he says. “Birds will generally make short-distance movements when their energy levels are low,” he says. “But those birds that fly even as far as southern Ireland at the moment aren’t going to find what they are looking for. They may have to go further into southern Europe.” The RSPB has also noticed that …