How does the egg tooth grow on an owlets beak?

The egg tooth is a small, hard protuberance that develops on an owlet's beak before hatching. It is made of keratin and typically forms around the time the embryo is fully developed. The owlet uses this tooth to break through the eggshell, allowing it to hatch. After hatching, the egg tooth usually falls off within a few days as it is no longer needed.