Not sure what to make of this?

[Fbett26]

Hi All, I have 2 backyard hens and wondering has anyone came across one if these? Found on ground outside coop, much much smaller in usual egg size? I'm sure it's come from one of the hens but why? Pic shows usual hen size egg compared to small one I found? Any ideas why it's so small or if anyone has had this happen? She'll is strong and formed. First and only small egg I have found since they started to lay??!

 

[JacinLarkwell]

It's a faerie/fart egg. Usually they're fine and safe. Just a glitch

 

[PippinTheChicken]

It's just a rooster/fart/fairy egg. Whatever you want to call it. It just happens sometimes, like Jacin said, it's nothing to worry about