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The birds seem to handle the cold fairly well. We don't heat the barn and it is not insulated. We do keep their water heated so it doesn't freeze though.
They're tough!

We had to take the water in some nights to stop it freezing. It's amazing they cope so well as they are originally jungle birds.

Glad you pointed out this little known fact. It seems most just think they've been around forever and have no idea of their origins.