A lot of fox squirrels have cream colored to orange bellies around here, greys white bellies.Terms may be regional but a "red squirrel" to me is a small one with different coloring than the first picture. The angle of the picture does not show the belly well. Eastern grey squirrels have white bellies and fox squirrels have brown bellies. Grey squirrels top out at a little over 1 lb. Fox squirrels can reach 2 lbs. So size and belly color are key characteristics but a young fox squirrel could be under a pound too. But it won't have a white belly.
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