Spawn Eggs are items that can only be obtainable in Creative Mode. This type of egg holds the qualities of spawning certain mobs. However, the mob it spawns depends on the type of spawn egg the player is holding. To use this item you will need to shift-click on a surface and the mob will spawn.
List Of Spawn Eggs
There are currently 15 different spawn eggs available in the game. Here they are (in alphabetical order)