Parasites, mostly worms, please.
 

I need to know more about these, for a project I'm doing, so, please, tell me anything you might know. Parasites that work in symbiosis, or eat the body quickly would be great, and I would prefer worms. Anything will do, as long as it's neeto. ;D

Look in the mirror, you will learn enough.

It moves its way in, gains protection, then screws everything else up, while requesting help, and refusing to deliver help?