Endemic to the Mentawai Islands, off the west coast of Sumatra
The Mentawai squirrel is one of roughly 20 species endemic to the Mentawai Islands off the west coast of Sumatra. Three subspecies are recognised: C. m. melanogaster, C. m. mentawi and C. m. atratus (Wikipedia, general species account).
The cached account gives no description, diet or breeding information; it notes only that this small, isolated population is under pressure from habitat loss (Wikipedia, general species account).
Description: Wildlife of Sumatra guide, Wildlife of Everywhere (wildlifeofeverywhere.com); general species information paraphrased from Wikipedia (CC BY-SA)
Mammals of the World