Dwarf Mouse
From MHWiki
"Often found living in remote areas, the dwarf mouse moves quickly making it more difficult to catch than the basic colored mouse."
The Dwarf Mouse is a breed of mice found in various locations. They are worth at least 450 Gold and considered easy to catch.
Dwarf Mice from the Laboratory occasionally drop Keys to the Town of Digby, giving hunters access to the Town of Digby.