ANATOMY

Detailed explanation-1: -Fertile eggs can be hatched by using an egg incubator. An incubator is an enclosed structure with a fan and heater to keep eggs warm during the 21-day incubation period.

Detailed explanation-2: -An incubator is a device simulating avian incubation by keeping eggs warm at a particular temperature range and in the correct humidity with a turning mechanism to hatch them.

Detailed explanation-3: -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-4: -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.