Egg

An Egg is an item that can be used to craft a couple of food items, or used as a throwable entity.

Chickens
Chickens lay eggs every 5-10 minutes and can be collected while on the ground.

Combat
Eggs are able to knockback mobs and gives the same effect as if the mob were being damaged. They deal to Ender Dragons, but no damage to other mobs. Eggs can also be fired from dispensers and are affected by gravity. Throwing eggs at neutral mobs will provoke them.

Spawning chickens
When thrown an egg has a $1⁄8$ chance of spawning a chick. If this happens, there is an additional $1⁄32$ chance of spawning four chicks (instead of just one). In other words whenever an egg is thrown there is a $1⁄256$ chance of spawning four chicks.

Trivia

 * If the player is standing near a chicken when it lays an egg, a "pop" can be heard. However, this does not occur in Pocket Edition.
 * Eggs will break midfall if hit by another projectile; The chance of spawning a baby chicken is not affected.
 * Throwing an egg at a portal will break the egg when it hits the portal.
 * If a player is killed with eggs, it will say "[victim] was pummeled by [killer]". This message is unused because eggs don't cause damage. Ender pearls and snowballs will also display this message.
 * If an egg is thrown at an adult chicken and a baby is spawned, the baby chicken will follow the adult chicken around, thinking the adult chicken is its parent.