If you left those eggs to become chickens, would two chickens come out of the same egg? Or just one? Or are they not viable?
I've pondered that myself on occasion. I came to the conclusion that an egg couldn't possibly hold two chicks (if you've ever seen them hatch out, it's a miracle one fit into the shell) therefore if both yolks were fertile and developing they would eventually destroy themselves because of space so no chick; if only one yolk was fertilized then the non fertile one would eventually rot and become toxic to the fertile one so again no chick. I'd love to hear if anyone can confirm this or alternatively recommend some good professional help for me.