Creature size
Creature sizes range from mouse sized to truly gigantic. The player cannot create an Epic Creature without mods (in Space stage the player can unlock the Supersizer tool, and can make Epics in the adventure creator), the largest creature so far known in Spore, as the game uses procedural generation to create them. Hyper Size creatures may exist on vast, unknown worlds.An example of an Epic creature is, for example, a normal creature might be as tall as you,while an epic creature can grow up higher than the trees!The epics can be destroyed more easily in the space stage,due to the fact you can runaway faster and stronger weapons.
-Spore Wiki