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According to New Scientist (This article and its images were originally posted on New Scientist October 28, 2018 at 03:06AM.)
Winter is coming, for the northern hemisphere at least. While many of us dig out our blankets and fleeced socks, some animals go searching for each other. Many small mammals huddle together to keep warm when the temperature drops. It now turns out that this huddling behaviour changes the composition of bacteria in the animals’ guts – and it does so in a way that slows down their metabolism and helps them preserve energy.
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