two egg yolks?

[bellamoran27]

recently my lady ducks started laying eggs, and for the fun of it, I thought I'd try to hatch some. it's been two days since and I decided to take a peak. I noticed two dark spots while candle lighting this egg... are there two yolks? and if so, will it still hatch? (with two ducklings??)

 

[Birdsong 82]

I've heard a double yolk chicken egg is almost impossible because there's not enough room for 2 to develop. I guess the same would apply but I have no ducks so I can't say for sure