Black thing in duck egg day 21!

[FarmInProgress]

What is this? I’ve seen this in infertile eggs but never one’s on day 21 they are growing...

 

[FarmInProgress]

Ok thank y’all

 

[Silkiechicken66]

What is this? I’ve seen this in infertile eggs but never one’s on day 21 they are growing...

I’m not sure what it is, but I’ve seen it a few times in incubated eggs. I’m assuming just waste or something?

 

[MGG]

I’m not sure what it is, but I’ve seen it a few times in incubated eggs. I’m assuming just waste or something?

Yep! I just saw another thread about this. Totally normal! Just embryo wastes stuck on the shell.