Can it be silkie egg??

[Sannasilkie]

I have two silkies and both lay very regularly, almost daily. They are now 9 months old.
This morning I went to check inside their coop and take them out to eat (both are broody and don’t come out unless taken) and I found these. The one on the right is the normal size, on the left is an egg half the size of my little chicken, then the other picture shows silkie egg, supermarket egg and this gigantic egg. how is that even possible?? Has anyone else had this happened?

We also have wild Muscovy ducks around, I don’t know at what point any of them could have made it in the coop though. We have a small backyard and normally don’t keep the door open for long periods..

 

[sourland]

I'd guess that it is a Muscovy egg.

 

[Sannasilkie]

It is indeed another birds egg as we don’t have a rooster and it seems to be developing under my girls. Supper weird and exciting

 

[HerbanChickenLover]

That is super crazy! Do you have an update on the mystery egg?

 

[Jenessa_096]

Yes! Please tell us what happened!