Leprechaun Mouse
From MHWiki
"This mischievous mouse loves to stir up trouble and play pranks. Although the Leprechaun mouse is certainly hard to find any hunter who is able to capture one will surely be bribed by the mouse to let them go.
Every Leprechaun is sure to have something valuable in their pot of gold including cash, gift cards and more!"
The Leprechaun Mouse is a breed of mice found in all locations. They are worth at least 10 Gold and considered near impossible to catch.
Leprechaun Mice grant real money prizes ranging from $25 to $100 (CAD) or gift cards.