Mummy Mouse
From MHWiki
"Hunters' lore describes these mice as completely invulnerable. These undead mice starve to enslave and take rule over the land they inhabit. A hunter will certainly need to be well prepared in order to face this enemy."
The Mummy Mouse is a breed of mice only found in the Mousoleum. They are worth at least 3,750 Gold and considered overpowering to catch.
Mummy Mice are invulnerable to the Physical Power Type, so Shadow traps must be used to catch them. They also only respond to Radioactive Blue cheese.