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Published online 29 June 2005 | Nature | doi:10.1038/news050627-8
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Big-brained birds less likely to migrate
Clever species stay put for winter, while others flee.
It takes brains to make it through the winter, at least if you're a bird. A new survey suggests that bird species that have evolved to fly south for the coldest months tend to be those that weren't smart enough to survive if they stayed put.
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