Did you find it in the nest just like shown in pic?Anyway, anyone have any thoughts on if it was probably a brown layer or more likely one of only 2 blue egg layers I have (due to the inner shell being clearly blue in color)?
Was the inside of the brown egg wet at all?
Inside of brown egg would have to be blue in order to be a true 'double shell'.
Oh, and..... Welcome to BYC! @jlwquilter