What is this substance?

Asked August 7, 2018, 4:01 PM EDT

I found this substance in my bird bath on June 28, 2018. It rained and filled the bird bath. Then it got hot and the water evaporated, leaving about 1 to 2 cups of a white puffy substance, the consistency of bread dough (pic attached). It dried into a crystalline substance (pic attached). Can you identify this substance?

Livingston County Michigan

3 Responses


My best guess is that this is mold or fungus that grew in your bird bath, that then dried out when the water dried up.

Here is a good link from the Audubon Society with information on how to keep your bird baths clean, and why clean bird baths are important for healthy birds:


Happy birding!

Thank you. Is this a guess, or are you aware of a mold or fungus that has these properties?

A best guess. I checked with an ornithologist and she guessed the same thing, but neither of us are 100% sure.