Vampire Mouse
From MHWiki
"In the darkest corners of the Mousoleum lurks an evil so terrible that its very name strikes fear into the hearts of even the bravest of hunters. Its name is never spoken, only whispered, "Mouseferatu".
When its coffin creaks, the land will shudder, the sky will darken, the earth will moan. It is then that you will know a Vampire is near..."
The Vampire Mouse is a breed of mice only found in the Mousoleum. They are worth at least 900 Gold and considered near impossible to catch.
Vampire Mice are invulnerable to the Physical Power Type, so Shadow traps must be used to catch them.