"Franklin's Ground Squirrels live in closed habitats such as tall grass in disturbed areas, shrubland, and woodland edges. Their bushy tails, generally gray coloration, and occurrence in wooded areas can lead one to confuse them with a tree squirrel, the eastern Gray Squirrel. In addition to eating vegetation and insects, Franklin's Ground Squirrels are known to rob birds' nests of eggs and eat toads, mice, and young hares."
Links:Mammal Species of the World
Original description: Sabine, J., 1822. Account of the marmots of North America hitherto known, with notices and descriptions of three new species, p. 587. Transactions of the Linnaean Society of London, 13:579-591.