Is there a species of white squirrel?

There is no distinct species of white tree squirrel in the United States. All white-squirrels, says the United States Fish and Wildlife Service, are mutations or sports of either the common gray squirrel or the fox squirrel. It is not unusual for whole families of ‘squirrels to be albinos. In fact it frequently happens that the albino specimens predominate in number over those having the normal gray color of the species. Sometimes in parks, or even in isolated forests, where the species is more or less restricted, the albinos breed true to color, and this leads many people to the erroneous conclusion that there is a distinct species of white squirrel in America. Precisely the same thing occurs at times with the black phase of the gray squirrel. There is no distinct species of black squirrel in America, although in many localities black individuals are numerous, and occasionally black families predominate over the gray. Because of the prevalence of black individuals in the southeastern species of fox squirrel if is scientifically known as Sciuras niger. Their color varies from glossy black to clay color mingled with black. The black squirrel of Central America, Sciurus melania, is also probably a mutation. Even the so-called white squirrels of Siam (Thailand) are generally light brown rather than white.