06/05/2026
I raise chickens and turkeys so these are the two poultry I reference here. Zippering is a term used in poultry incubation to describe the final stage where a baby cracks the eggshell in a continuous, zigzag, or circular line to break out and hatch. Poults (turkey babies) should zipper in a circular line. Chicks (chicken babies) tend to zigzag more. All poultry use what’s called an egg tooth on the top tip of their beak to initially pip (break) the egg and then zipper it with that tooth to hatch. The egg tooth typically falls off during the zippering process or shortly after hatching. I am always amazed at the zippered turkey eggs as the shells and membranes are thick!