Howdy, From http://www.enchantedlearning.com/subjects/birds/info/chicken/egg.shtml The site has pictures and lesson plans. The Formation of an Egg: The Yolk: The chicken egg starts as an egg yolk inside a hen. A yolk (called an oocyte at this point) is produced by the hen's ovary in a process called ovulation. Fertilization: The yolk is released into the oviduct (a long, spiraling tube in the hen's reproductive system), where it can be fertilized internally (inside the hen) by a sperm. The Egg White (albumin): The yolk continues down the oviduct (whether or not it is fertilized) and is covered with a membrane (called the vitelline membrane), structural fibers, and layers of albumin (the egg white). This part of the oviduct is called the magnus. The Chalazae: As the egg goes down through the oviduct, it is continually rotating within the spiraling tube. This movement twists the structural fibers (called the chalazae), which form rope-like strands that anchor the yolk in the thick egg white. There are two chalazae anchoring each yolk, on opposite ends of the egg. The Eggshell: The eggshell is deposited around the egg in the lower part of the oviduct of the hen, just before it is laid. The shell is made of calcite, a crystalline form of calcium carbonate. This entire trip through the oviduct takes about one day. Growth of the Embryo: The fertilized blastodisc (now called the blastoderm) grows and becomes the embryo. As the embryo grows, its primary food source is the yolk. Waste products (like urea) collect in a sack called the allantois. The exchange of oxygen and carbon dioxide gas occurs through the eggshell; the chorion lines the inside surface of the egg and is connected to the blood vessels of the embryo. The Incubation Period: The embryo develops inside the egg for 21 days (the incubation period), until a chick pecks its way out of its eggshell and is hatched. Hope this helps.

Well, see, the male chicken (called a rooster) gets on top of the female chicken (called a hen). They do the woopy thing for a while and the next day, voila! The hen lays an egg

Eggs are formed in the hen's body in steps starting with the egg yolk. The yolks are formed in clusters called ovaries and usually ripen one at time. When one is ripe it goes into a tube called the infundibulum where the chalaza strings are attached. Then it passes to another section of the tube called the magnum where the egg whites are formed around the yolk. Then it goes down to the part of the tube called the isthmus, this is where the shell membranes are formed. Then it goes to the part of the tube called the shell gland, and this is where the shell is formed around the egg. Now it can be called an egg and is ready to be laid, usually one each day:-) With help from wiki:)