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Photo: Tomer Ben-Yehuda
Sundasciurus hippurus
Range
Borneo, Sumatra and the southern half of the Malay Peninsula
The horse-tailed squirrel is found throughout Borneo and Sumatra and the southern half of the Malay Peninsula, including all of Brunei and Malaysia and parts of Indonesia and Thailand. It is the most colourful and largest of the Sundasciurus tree squirrels (Wikipedia, general species account).
An old mention of it in Vietnam in 1831 has not been repeated in later accounts of its range (Wikipedia, general species account).