These squirrels live in our backyard and we are unsure of whether or not they are Fox Squirrels or Eastern Grey Squirrels. My hypothesis is that they are a hybrid of the two
Neither of the two species are native to the Pacific Northwest and are primarily found in residential areas and city parks. Gray squirrels are described as having a grayish coat and a more square jawline with an exceptionally bushy tail. Fox squirrels are described as having a more reddish coat and a slightly thinner tail with a very pointy face. But Fox Squirrels have a more yellow belly fur while Gray Squirrels have bright white belly fur.
The squirrels in our yard do not fit either of the descriptions and could, at the same time, fit either description.