Oops!!

[Bills vs Beaks]

Look at the diagram I posted. Those dots are the germinal discs. Note the eggs that you can see them in are very dark but the one that isn't is light like the discs you can see so it's possible that the germinal discs are showing up on the orange ones and not the yellow merely because it just doesn't blend in.

 

[Bills vs Beaks]

Btw the egg in the photo looks like it has a mark, but it could be the light.

 

[lomine]

Every egg has a blastodisk. That is the hen's genetic contribution. If the hen has been mated the male's (rooster, drake, etc) is added and the blastodisk becomes a blastoderm. It looks kind of like a bullseye. It is hard to tell from the picture whether it's a blastodisk or blastoderm.

Does one of your ducks have a curly tail feather(s)?

 

[Bills vs Beaks]

I've never seen anything in my eggs ever(duck or chicken)! And my family and I eat a LOT of eggs. Is that weird or what?

 

[Bills vs Beaks]

Here's a blowup from my pc showing the dot.

 

[dotknott]

I agree, it's hard to tell even blown up. It's definitely blasto, but I can't tell if I'm seeing the bullseye of blastoderm or just circle of a blastodisc.

I didn't think it was in all eggs when I heard about it.. then of course I looked and it was in every egg.

 

[dotknott]

Here's a photo I took last year on the matter. I had 3 males at the time and can see the bullseye.

The other possibility is that you have a wild male around. It's less likely than just having a male that you think is female, but it's still a possibility.

About 2 years ago I didn't have any males. One Saturday I was on the back deck eating breakfast when the ducks started making a commotion. I found that a wild bird had landed in the stream and was courting my female ducks (very funny to watch the tiny wild malard trying to get it on with my massive saxony females.)

I immediately sought out a saxony male and added him to my flock. I've watched the males get territorial when a wild male lands in the stream.

 

[Bills vs Beaks]

Ooooo so I have to look really hard to see it? I've never seen one!