Whose egg is this?

[MrsMcCluck]

The small egg is a normal duck egg. I found it in the duck house this morning. My turkey lives with the ducks so could it be from her?

(I know that it isn't advisable to put a turkey in with ducks but she is best friends with a young muscovey and we currently don't have any companions of her own kind just now.)

I thought Turkey eggs would be speckled, but I did clean it and maybe wiped the speckles off?

It isn't a goose egg as they live in another house.

Any ideas?