World’s tiniest chicken egg?

[Windus]

Collecting eggs tonight and I find this on the ground right in front of the door to the coop. Looks like just a teeny tiny chicken egg. What do you all think?

 

[The Phantom]

 

[PearlaMae123]

looks like a fairy egg! normal, but no yolk. do some research to see if your hens need extra protein.

 

[Relleoms]

I think that’s a fart egg! I had one this week that was rubber (no shell) but had the green pigment!

 

[Brahma Chicken5000]

I believe they are called fart eggs (?)
Here’s one I got from my Splash Andalusian pullet last year

 

[crestfosterfarm]

It's so cute!

 

[aart]

It's a WINDus egg!

Fairy, fart, wind, rooster eggs are usually from a tiny piece of tissue breaking loose from the reproductive tract, or an immature ova(yolk) and the body forms an egg around it. Color can be darker than 'normal' as the pigment coating released has to cover a much smaller area so is thicker. Can happen with any age layer.
Think it's explained in this excellent video
Egg Formation Video
(which is worth watching even if it doesn't)