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Not all birds migrate in the winter. Why is this, and what do they do to stay warm?
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Norwegian mammals and birds have many different methods of surviving long, intense winter nights
www.sciencedaily.com/releases/...
Norwegian winter nights aren’t for sissies
gemini.no/en/2015/03/norwegian...
“For birds and animals that must live out in Norway’s frigid winters, every second has to be spent finding enough food not just to survive the day, but also the long hard night.”
Why don’t all birds fly south for the winter?
tuftsjournal.tufts.edu/2008/03...
“Whether or not a bird flies south for the winter depends a lot on what food the species eats.”
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