my guess would be a hybrid between a Variable Squirrel and a Prevost's Squirrel. It has elements of both species. If it isn't a hybrid then it is a very odd-looking Prevost's Squirrel.
There are several sub-species of Prevosts, but none really look like this one, apart from the red colouring, unless it is a particularly young animal perhaps ?
my guess would be a hybrid between a Variable Squirrel and a Prevost's Squirrel. It has elements of both species. If it isn't a hybrid then it is a very odd-looking Prevost's Squirrel.