Where did you get the eggs? If they were local I’d suspect that one was already incubating. If it was via postal service I’m not so sure that would happen but, hey, anything is possible. If it had begun incubation and the temperature in the transportation was very warm (possible with the heat wave) then MAYBE!! a mail order egg could have come through alreay developing?? Just a wild theory.I moved her to a new nest with a dozen eggs so that couldn’t of been possible plus I don’t have a rooster
