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Egg tooth
An egg tooth is a small protuberance on the beak or nose of vertebrates that are hatched from eggs, i.e., birds and reptiles. Some lizards and snakes develop a true tooth that is shed after use; birds and other reptiles generally develop an analogous epidermal horn that is reabsorbed or falls off. Both varieties of egg tooth assist in the breaking or tearing of the eggshell, a process known as pipping.
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