Independent: The arrival of thousands of swans fleeing plunging temperatures in their breeding grounds in western Siberia is usually one of the first signs that winter is on its way in Britain. But wildlife experts are reporting that the swans’ 1,800-mile mid-October migration has so far failed tomaterialise, with climate change turning the once famously harsh Russian region into a more inviting winter haven for the majestic birds. Some 300 Bewick’s swans — of the 8,000 or so which usually …