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Egg tooth

A Senegal parrot chick at about 2 weeks after hatching. The egg tooth is near the tip of its beak on the upper mandible.
Borneo short-tailed python (Python breitensteini) hatchling with egg tooth visible
A painted turtle hatchling with an egg tooth.

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]

  1. ^ "Egg Tooth - an overview | ScienceDirect Topics". www.sciencedirect.com. Retrieved 14 February 2021.
  2. ^ What animals have pleurodont teeth Archived 2021-08-30 at the Wayback Machine askinglot.com.

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