In the past I have enjoyed watching birds at my heated  birdbath.  However, in the book, The Bird Watching Answer Book,by Laura Erickson she suggests not using one if the temperature goes below 20 degrees F.
She also suggests that if you do use one to cover it with a grille of wooden dowels so that the birds can only drink not bathe.

     Does anyone have any  ideas about this?  Thank you
Elda

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