Egg tooth
Used by offspring to break out of egg while hatching / From Wikipedia, the free encyclopedia
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An egg tooth is a temporary, sharp projection present on the bill or snout of an oviparous animal at hatching. It allows the hatchling to penetrate the eggshell from inside and break free. Birds, reptiles, and monotremes possess egg teeth as hatchlings.[1] Similar structures exist in eleutherodactyl frogs, and spiders.[2]