Even if a birdbath is just providing a source of water for birds, and the birds aren't using it as a bathtub, it's a positive for wildlife and worth doing.

Anonymous wrote:If it's mostly decorative and the spot where it is placed gets sun, consider this--no problem with mosquito eggs and you'll have an instant fountain:

https://www.amazon.com/dp/B071CDHRR6/ref=psdc_402303011_t2_B01GO21SQM

My aunt got this for Mother's Day and loves it! I checked out something similar at a local bird store and the one thing to remember is that your bath has to be deep enough to cover the base with water.