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without any obvious assistance from humans) around 10,000 years ago.
) to appear on the continent migrated (again, presumably across the Bering land bridge) from Europe at the end of the Pleistocene (around 1 mya) and, from here, Red and Arctic foxes colonised much of North America.
Recent genetic work by Keith Aubry and his colleagues at the Pacific Northwest Research Station in Washington, however, has revealed new information on the spread of the Red fox in North America.
Aubry’s data suggest that this species first reached North America during the Illinoian glaciation that lasted from roughly 300,000 to 130,000 years ago; during the next 30,000 years (the Sangamon interglacial period) the foxes spread south from Alaska, across what is now the contiguous USA.
(Back to Menu) Taxonomy: Many texts on fox natural history cannot help but draw comparisons between the fox and the cat and, if you spend any time watching them, you’re certainly struck by how similarly they behave: both have the same delicate, tripping gait; both stalk and pounce in much the same way; both sit and sleep with tails curled around their bodies; both twitch tail tips to allow young to practice hunting; both will use a paw to scoop unwary fish out of a garden pond.
Anatomically, however, foxes have the large ears, the long pointed muzzle, the 42 teeth and the non-retractable claws (five on forefeet and four on hind) that we typically associate with dogs, although they do share the vertically-slit pupils commonly associated with cats (larger canids, such as wolves and domestic dogs, have round pupils).