Poo or egg or what?? Help please!!

[Birdmom2020]

Looks like a nut or seed or something....? Weird...

Thats what I thought. Now that it's drying out it's turning yellow in the middle like the same color as dried egg yolk

 

[The WinterWolf]

This morning when I checked there was a little piece of the same thing inside the shell of a soft shell egg.

who? what? when? why? how? what just happened?

 

[Birdmom2020]

who? what? when? why? how? what just happened?

I added more pics to the original post.

 

[P_Dub]

Somewhat similar experience here