From the Super Mario Wiki
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Ratooeys are a species of rodent that have only appeared in Paper Mario: The Thousand-Year Door. In fact, Ratooeys are so rare that there are only two known Ratooeys in existence: Lumpy and the Businessman.
Apparently, Ratooeys come in a multitude of colors; however, green and blue are their only confirmed fur colors. Additionally, Ratooeys are very tall compared to other species. Ratooeys achieve this height by standing upright on their hind legs.