Crawlers are the reason Mushroom Islands exist.
Crawlers are the reason Herobrine has white eyes.
Crawlers are the reason Endermen get into the real world.
Crawlers are the reason "The end" Exists.
Long ago, in the world of Minecraftia, a land untouched by human or war.
The Creepers were new, and introduced by the improper birth of a pig.
The Chickens were happy as can be, taking baths in ponds and lakes and oceans.
Spiders and Slimes were In caves, happy as can be, not hurting a thing.
But one day, a man named "Steve" Walked into the fair lands, destroying trees and killing pigs. Now there was one thing that nobody talked about, and the animals feared. The Crawler.
The Crawler was disgusted by Steve's Nature.
Steve once saw the crawler, but didnt think much of it, Thinking it was a spider.
One day Steve made a boat and sailed off to his homeland. Animals came out as they used to, thinking he had left forever. But when he came back, it was worse. More men had come to Minecraftia, and did what Steve had done. There had to have been Millions, Maybe Billions of them.
The Crawler had to take action. It started attacking the men, but only at night, for that was when the blood did not shine in the twilight. It then sucked up the blood and walked away.
The dead men's corpses turned into zombies, or if the man was a weak man, turned into skeletons.
They were cursed to hide in the dark also, as the sunlight was far too bright for their now evil eyes.

Off to bed with you now, for next time, you will learn more. So much more.