The autumn bird migration is in full swing. Redwings, pink-footed geese and many other birds are arriving from northern climates, while swallows, swifts and other summer visitors are flying south to warmer places. Birds migrating south could hardly be blamed for lingering and enjoying the mild autumn here. Over the past 60 years, birds flying off in autumn have been increasingly reluctant to leave the UK as temperatures have risen. A study on Fair Isle, Shetland, found swallows and house martins leaving for Africa up to a fortnight later than a few decades ago, while in spring some birds are…

Source: The Times September 29, 2016 23:13 UTC