From our Environment correspondent, Phil Paige .....
http://www.bbc.co.uk/news/science-environment-34316314
Prior to today the reason was because of global warming (cont. on p.94 ).
MIGRATION
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Re: MIGRATION
Yep, feed the birds and animals and they will stay around. I am delighted a survey to which I contribute has used mine and thousands of others data to provide these conclusions.