Scotsman: TINY birds that already face epic annual migrations could have to fly up to 250 miles further because of climate change, experts have warned. The scientists behind the research have said that the extra distance added to already-marathon journeys could be the “difference between life and death” for some birds. Those likely to be affected include the whitethroat, a warbler about the size of a great tit commonly seen in Scotland during the summer. It could be forced to …