The Delmarva Peninsula Fox Squirrel (Sciurus niger cinereus) is one of ten recognized subspecies of fox squirrels. Like all "fox" squirrels, the Delmarva has a full and fluffy tail. It is frosty silver to slate gray in color with a white belly. It grows up to 30 inches long, which includes its 15-inch tail. This species is quiet and retiring, unlike the common gray squirrel, and can be very difficult to find. Despite being the largest tree squirrel it will run away from any confrontation, and being less agile in trees, will usually run along the ground from one tree to another rather than leaping through the branches.

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