They have fat, slimy bodies similar to slugs that are grey in color, with sickly white underbellies and pale yellow heads. Tiny hooked legs and suckers on the underbelly allows them to crawl along walls and ceilings. Much like a leech, they have a small sucker-like mouth full of sharp, shearing plates of horn. Instinct: to protect the filth

• Latch on and suck blood