Tree Squirrel from Palo Alto. the Western Gray Squirrels are native to the area, but Fox Squirrels have been introduced. I think that these look more like the Fox Squirrels with the brownish sides. They could also be a hybrid mix. California 2022.
Tree Squirrel the black morph of a Fox squirrel is more common than with a Western Gray Squirrel. California 2022