I have banties/reds/leghorns and ducks........Last night when I was making cookies I cracked opened a bantie egg and it was rotten (layed on 8/27, and today is 9/9), thought it was a fluke....and then this evening (9/10) while I was washing up the duck eggs, I thought one looked really dark through the shell. I cracked it open and sure enough it was rotten too. The eggs don't smell, they have very little white in the shell, and the yoke looks scrambled, they have one little dark spot in the end of the egg..... The chickens and ducks are free range in a pasture with goats, they go out in the morning and we put them away at night. Not sure what is causing the eggs to be like this. Any help would be great! THANKS!!!