Icy Canada geese. It's amazing that the cold doesn't seem to affect them. 😄
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They have a weird ability to regulate their blood vessels in their legs to keep themselves warm.
Amazing abilities. Some of the ones that live here migrate south for the winter, so I wonder if they have a different circulatory system.
They try and stay here as long as possible and some years they don't even leave. But if it gets too cold they start flying south.