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12-Aug-2017 00:23

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.So, the result was two isolated populations (or clades): one in Alaska (Holarctic clade) and one in the south (Nearctic clade).

As fox populations rose in Eurasia, those in North America appear to have dwindled.without any obvious assistance from humans) around 10,000 years ago.Indeed, other fossil data imply that the ice forced foxes into the warmer southern regions of Europe (e.g.On the next page enter the ABOVE email address, click "SET MY OWN" and amount as 20, your name, message( part of the question) and delivery date (now) and CHECKOUT.