The life cycle of a chicken begins with an egg yolk inside a hen's ovary. The yolk is fertilized inside the hen if it mates with a rooster. It is then released into the hen's reproductive tract where it is surrounded by egg white and other layers. As it moves through the tract, fibers called chalazae anchor the yolk. The eggshell forms around the egg just before it is laid. If fertilized, the embryo develops over 21 days before hatching as a chick. The stages of development include the formation of organs and feathers.

1. Life Cycle of a Chicken By Yu Jie and Siew Leng of Pri 3.9

3. Stages in its Life Cycle

5. Inside a Chicken Egg shell blastodisc chalaza Air cell yolk Thick albumin

6. Inside a Chicken Egg Day 1 Day 6 Day 13 The brain and nervous system begin to form. The head begins to form. Blood appear. The eyes begin to form The beak becomes visible. The wing bends at the elbow. The ribs begin to appear. The muscular, thick-walled part of a bird's stomach begins to form. The intestines begin to form a curve that bends round and crosses itself. Fingers of the wings are covered with feather a small rounded part or organ of the body . The left and right collar bones fuse to form the wish bone.

7. From Egg to Chick Day 17 Day 21 The beak turns towards the air cell. The egg tooth pips through the shell. Exhausted and wet - but alive - the chick has hatched!

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