Ysilimari

From Ewokpedia

Ysilimari are naughty little buggers with a penchant for crawling into a man's rectum. The Ysilimari have rectal memories, and can remember every rectum they've ever been in.

Anyone known to be keeping a Ysilimari as a pet in the Empire was to be arrested under what was called "Roderick's Law". Although very few people were known to ever actually attempt to own them as pets, due to their habit of rectum crawling.

Evidence suggests Nute Gunray was a Ysilimari.