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Following the retreat of ice from the last ice age (the Late Glacial) some 15,000 years ago, many of the larger mammal species began to re-appear and extend their range northwards.

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When the ice melted the Holarctic clade spread south and east, while the Nearctic clade spread north, the two meeting in central Canada.

Aubry’s data reveal more than just the distribution of foxes in pre-history, it also elucidates the relatedness of the animals currently inhabiting North America (see: Taxonomy).

Iberia, Italy, southern France, etc.) for only a (geologically) brief period, after which they quickly returned to central Europe and Britain; at the time, the UK was connected to the European continent.

The flooding of the Doggerland ‘bridge’ around 6,500 years ago isolated Britain’s foxes from those in Europe, putting an end to any natural mixing of the populations.

and is thought to stem from the now extinct small fox-like , which lived in North America.

During the late Miocene, around 10 mya, something important happened: the third, and for our purposes most important, canid radiation began.

Previously it was believed that the first modern Red foxes (i.e.

) 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.

The large ice sheet that covered most of Canada and the northern fringes of the USA from around 100,000 to 10,000 years ago (during the Wisconsin glaciation) kept the Red foxes in Alaska (the population of which was added to by a second wave of colonisation from Eurasia) separate from those in the southern USA.

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