STRANGEST phenomon. what?! can chickens incubate eggs internally?

[Amy's Animals]

So, heres a really weird story.
Today I let my chickens out to free range a little bit. When I came to give them leftovers from dinner, I noticed a little dead bird layin on the ground under my sister's bedroom window. When I looked, I noticed it was a chicken, no doubt about it. Still completely wet like it had just hatched, but no shell. I go what the hell?
I'm 1000% sure non of my chickens were broody, and it can't have been any of my neighbors since we live a ways out and our closest neighbors don't have any chickens. Then I thought, well it could have been dropped by a bird so I looked up, impossible since there is an overhang right there. I sorta ran out of ideas when it suddenly came to mind "could it have been possible that one of my chickens incubated an egg inside?" I have 2 roosters and my eggs are fertile. I've never heard of anything like it, but it the only thing that could possibly make sense. I don't know if the chick was alive or dead when it came out but it looked a bit mangled like it had been pecked at and perhaps even dragged, no egg shell anywhere though but the chickens couldve eaten it.
Like I said, I have no clue if this is even possible but I can't think of any other ways it couldve gotten there. What do you think?

 

[Chicky Tocks]

 

[BooBear]

Maybe one of your hens was sitting on an egg in a place you did not know about?
I never heard of a hen incubating inside unless maybe she was egg bound? If so, you may want to give your hens a really good look over to make sure they are ok.

That is bizarre.

 

[Amy's Animals]

nope impossible. my chickens are kept in a run pretty much all the time, its large, but no where to hide. and i do i headcount every night to make sure no one is missing.

 

[BooBear]

If you think it really came out of a stuck egg in the hen then you should give your girls a look over to try to figure out which one and that they are ok.
I would imagine that could damage the delicate insides of the hen. May want to see if any experienced folks have any ideas.

 

[ninjascrub69]

 

[Imp]

Could there have been an egg hidden in the bedding material?

or Stealth Feral chickens?

Imp- How strange. Any Pictures?

 

[woodmort]

I don't think this is possible since, as I understand it, the sperm goes onto the egg just before the shell is added. This would mean a fully formed egg would have to have been "stuck" inside a hen for 21 days. Unless you have a lot of chickens and don't pay much attention to them you would have surely noticed a hen in that condition. Without actually seeing your setup I wouldn't begin to tell you where that chick came from but I think it is safe to say it wasn't internally incubated.

 

[Gallo del Cielo]

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[rhaj]

maybe it was less than 21 days and not fully formed? she said it was mangled, so maybe hard to tell the condition?