Egg growing on the outside of an egg??

[bobelot]

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What is this??

 

[Poultry parent]

It could be a lash egg

 

[bobelot]

Is it dangerous???

 

[Poultry parent]

It's generally a sign of infection. I've never dealt with one, so your best bet is to do some research

 

[azygous]

Here you go. http://www.the-chicken-chick.com/2012/01/how-hen-makes-egg-egg-oddities.html