It's a first! The first video of a Grey-bellied Squirrel (Callosciurus caniceps) on the net, and I must say I'm surprised as they are a beautiful and confiding Asian squirrel species.
The tail pattern is very interesting as the edges appear blurry, especially in the dim light of a forest. Could this be an anti-predator structure, making it harder to focus on the squirrel?
Some more info.
The Grey-bellied Squirrel is a species of rodent in the Sciuridae family. It is found in forest, plantations and gardens in Peninsular Malaysia, Thailand, southern Myanmar, southern China (Yunnan) and possibly western Laos. It has been introduced in the Ryukyu Islands in Japan. As suggested by its name, its belly is usually grey, though sometimes reddish on the sides. Depending on subspecies and season, the upperparts are grey, yellowish-olive or reddish.