What causes a double shelled egg?

[BibiJ]

Can anyone tell me what causes a double shelled egg of two different colors and what in the world is this dinosaur looking thing??

 

[nuthatched]

They rubbery looking thing is likely an egg membrane and double shelled eggs are caused by an egg staying in the egg shell sprayer too long and getting a second coat. Both can be signs of reproductive disorders. What's your birds breeds and diet?

 

[BibiJ]

They rubbery looking thing is likely an egg membrane and double shelled eggs are caused by an egg staying in the egg shell sprayer too long and getting a second coat. Both can be signs of reproductive disorders. What's your birds breeds and diet?

She is a Cuckoo Maran. They are eating Nutrena nature wise all flock pellet feed.
Daily treat mix of scratch, black oil sunflower seeds, mealworms. Frozen fruit/veggie scraps.
Regular access to grit and oyster shell.
They are a little over a year old and this particular hen has gone broody twice.

 

[nuthatched]

Daily treat mix of scratch, black oil sunflower seeds, mealworms. Frozen fruit/veggie scraps.

Cut this out completely or reduce it to once a week. This is pretty bad for them in this amount as it causes fat build up, nutritional deficiency and laying problems.

 

[BibiJ]

Cut this out completely or reduce it to once a week. This is pretty bad for them in this amount as it causes fat build up, nutritional deficiency and laying problems.

Thanks for the info! I will give this a try!

 

[aart]

Not sure another shell can be formed like that in the uterus.
First thought is that the lighter egg got stuck in another birds broken egg,
but it sure fits tight.
@Ridgerunner might know about a second shell forming like that.

 

[Ridgerunner]

@aart I have not seen this myself, it is really rare. But I have read about it. Here, for example.

https://backyardpoultry.iamcountryside.com/eggs-meat/how-a-chicken-lays-an-egg-inside-of-an-egg/

 

[aart]

@aart I have not seen this myself, it is really rare. But I have read about it. Here, for example.

https://backyardpoultry.iamcountryside.com/eggs-meat/how-a-chicken-lays-an-egg-inside-of-an-egg/

Yes, thanks, aware of that but this seems different.......no yolk, albumen, membrane in the outer shell.

 

[nuthatched]

Not sure another shell can be formed like that in the uterus.
First thought is that the lighter egg got stuck in another birds broken egg,
but it sure fits tight.
@Ridgerunner might know about a second shell forming like that.

Chickens don't have uterus, do they?

 

[aart]

Chickens don't have uterus, do they?

Yes, better known as the shell gland.
I think it's explained in this excellent video, which is worth watching regardless: