double yolked eggs of other fowl?

[Bryce Thomas]

Why have I never seen a double yolk ostrich egg? swan egg, etc...

 

[vall]

I'm guessing because those species have a natural, more accurate cycle and lay fewer eggs in general. I have gotten plenty from my quail, usually when they first start laying. They lay early (some start at 6 weeks) and often so are more prone to mistakes like double yolks.

 

[gimmie birdies]

day 11, I thought I had one double turns out 7/8 or so are doubled. Most only live to day 10, these don't look great, but they can keep going till they aren't any more. Barred rocks.