Yes lol I have. Only a few in a decade though. I was more concerned about the rubbery egg with the tail I have seen those also and that’s when I get out my calcium gluconate and give one ML to the duck who did it. IF IF IF I can figure out which one it was. lol
What is their feed and how do you supplement their calcium? If you use oyster shells on the side what kind of oyster shells crushed or flaked ? do you ever give them back their own shells after cleaning drying, baking and crushing?