Why Some Birds Don’t Migrate
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Not all birds migrate within the winter. Why is that this, and what do they do to remain heat?
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Norwegian mammals and birds have many various strategies of surviving lengthy, intense winter nights
http://www.sciencedaily.com/releases/2015/03/150302081144.htm
Norwegian winter nights aren’t for sissies
http://gemini.no/en/2015/03/norwegian-winter-nights-arent-for-sissies/
“For birds and animals that should dwell out in Norway’s frigid winters, each second must be spent discovering sufficient meals not simply to outlive the day, but in addition the lengthy exhausting night time.”
Why don’t all birds fly south for the winter?
http://tufts...