Squirrels - White Belly

Ever since seeing the golden squirrel in our front yard we've been on the lookout for other squirrels that are a bit out of the ordinary.  One day we noticed a white-belly squirrel enjoying corn in the front yard.  Since spotting the first white-belly squirrel we've noticed another and possibly a third.  The squirrel pictured here seems to be heavier than the others.  The skinnier ones have a less full looking tail.  While going for our walks in our neighborhood we've noticed more white-belly squirrels.