How do animals keep warm in subzero temperatures in Canada?

jakevevo(2)
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Hello Steemit family!

In Canada, 24 swallows were captured cuddling up on a branch to keep warm against the snowy weather.
47579713_2716927528348050_4894378369258356736_n.jpg

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How do animals keep warm in subzero temperatures in Canada? | Ecency