Tufted Ground Squirrel
Rheithrosciurus macrotis
- Vulnerable
- Card rarity: Rare
- Mammals

The tufted ground squirrel or groove-toothed squirrel is a species of rodent in the family Sciuridae. It is the sole species in the genus Rheithrosciurus. It is found only on the island of Borneo. Confirmed elements of its diet include nuts, seeds and insects, for which it has been filmed foraging on the forest floor.
Classification
- Class
- Mammalia
- Order
- Rodentia
- Family
- Sciuridae
- Genus
- Rheithrosciurus