Egg irregularities are common. Backyard chicken-keepers need not worry unnecessarily about the occasional strange-looking egg. Take a picture of it, discuss it at the water cooler next day and get a good chuckle out of it. They happen fairly often and the vast majority of the time they do not indicate any cause for alarm. In order to understand why irregular eggs occur, it’s important to understand how a hen’s reproductive system is supposed to work when firing on all cylinders.