A couple of my Cornish Rock's MAMMOTH eggs!

[SlyFirefly]

when candled it look as though a double yoker

 

[New2Chicks97]

The only girls that lay jumbo eggs here are our Sexlinks and usually only when they skip a day. They are big enough that cartons won’t close around them and most are 2-3 yolks. No pictures as my husband uses this big ones for his breakfasts on the weekend!