ANATOMY

Detailed explanation-1: -The chick breathes air for the first time, and you may hear the chick peeping inside the egg. This is called pipping. On the 21st day, the chick begins to break out of the shell. Using its egg tooth, it first pecks a hole through the shell. Then it pecks a circle around the end of the egg.

Detailed explanation-2: -The only ‘tooth’ seen in birds is the ‘egg tooth’. This is a hard, sharp protrusion on the rostrodorsal side of the upper beak in birds that have just hatched. The egg tooth helps the chick to break through the eggshell. The beak is formed by bone from the upper and lower jaws, covered by horn.

Detailed explanation-3: -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. Similar structures exist in Eleutherodactyl frogs, and spiders.

Detailed explanation-4: -A hatching tortoise first breaks its eggshell using a small sharp protuberance (egg tooth) located between the outer nostrils and the upper jaw. The egg tooth disappears a few days posthatching. Upon emergence from the egg the carapace and plastron are very soft.