Is There Anything I Can Put in a Birdbath to Keep It From Freezing?

http://www.motherearthnews.com/nature-and-environment/keep-birdbath-from-freezing.aspx

Is there anything I can put in a birdbath to keep it from freezing?

There are a number of commercial birthbath heaters on the market, as well as heated birthbaths. Retailers for either are easily found with a quick Internet search, or you might try your local garden supply shop. You can find out more about taking care of visiting winter birds in Bringin’ in the Birds by Terry Krautwurst.

— Aubrey Vaughn, assistant editor