The gray fox has been in North America for millions of years, but the more common red fox is a relative newcomer, crossing over during more recent Ice Ages. The two kinds of fox are not only different species, they do not even belong to the same genus.Besides differing in color and aggressiveness, the gray fox has semi-retractable claws that allow it climb trees to escape from predators. Martha Foley and Dr. Curt Stager discuss the slyer end of the canid family.As a bonus see the video below of baby gray foxes that live under Joel Hurd's barn in Pierrepont.