Everyone knows Skeletons are better than Creepers.  They have mad bow hacks, and there face isn't hard for about half the Minecraft community to recreate in blocks.  They also look much cooler.  But the thing that really sets these two species apart, is the Skeleton's superior level of technological expertise.  Being centuries ahead of our explosive, huggable, green friends, the Skeletons usually have some spare change to help out the Creepers.  What most of us ignorant players don't know, is that Creepers use Skeleton arrows as currency.  I guess it isn't a surprise most people don't know, after all - we have to go to a website just to change our clothes.  But I'm just getting off topic now.  Occasionally, a Skeleton will give a creeper some money, by firing it from their bow.  Assisting Creepers is frowned upon by Most of the Skeleton community, and in the special Skeleton chat, its broadcasts a message whenever a Skeleton pays money to a Creeper.  So the other Skeletons don't know, the one who is giving the Creeper money shoots it from his bow so his fellow Skeletons don't know.  The Creeper then leaves a music gift as a "thank you."  Similarly to players, Creepers can respawn when the die, so they die, then appear back at their house where they can store their money.  However, there is something the Skeletons don't know.  Creepers want to be the dominant species.  They've split their school system into three parts - One for aspiring young Creeper witches, who study Witchery and wish to assist in the revolution with their magical powers.  Another for the Creeper inventors, who learn the ways of Thermal Expansion.  And of course, the soldier Creepers who study Flans Mod, and use helicopters and guns to assist them in battle.  The Creepers are using the donated money to buy everything they need for this project.  So be ready - if the Creepers defeat the Skeletons, who knows what they will do afterwords?  Maybe we will be next.