I usually have a fried chicken egg from our flock every morning with OJ and a piece of toast. Yesterday, we were out of chicken eggs, and I had been getting a duck egg every other day for 4 days. So, I decided to have a duck egg. I cracked it into the pan, and I was really grossed out. The yolk was a hard green lump, and it wouldn't even spread out in the pan. I know it's wasteful, but I could not bring myself to eat that. I gave it to the dogs. I don't know why it was so gross, I have had duck eggs in the past that were okay. I guess she just ate something different that made the egg thicker and a different color? I know it wasn't rotten, since I look in the nest box every day. I was considering selling duck eggs along with my chicken eggs once I get my egg business off the ground, but I don't want to lose costumers! I have used them for baking and they were great, but that's about all they are good for!