Monster Mouse
From MHWiki
"Deep within the bowels of the Laboratory, alone and miserable, lurks a monster so terrifying, so hideous, that no one dares to speak its name.
Known only as Dr. F. Romage's Monster mice, their horrible howls can be heard rumbling throughout the walls of the Lab, haunting those who dwell close enough to hear them."
The Monster Mouse is a breed of mice only found in the Laboratory and Mousoleum. They are worth at least 9,100 Gold and no more than 10,000 Points. The Monster mice as of present, are worth the most gold and points as compared to all other mice.