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This radiation was probably in response to a vacant niche opening up as the borophagines started to die-out, and not only marked the birth of all the dog species we know today but also heralded the appearance of three modern-day genera in the south-western USA: (true foxes).

In essence, it was around 10 mya that the fox lineage split from the wolf-dog lineage.

The evolution of carnivorans appears to have been a gradual process that happened in both North America and Eurasia, making it difficult to infer when it all started.In their 1982 comparison of Red and Arctic ( comes from the Old World and dates to the early Pleistocene (between 1.8 and 1 mya) of Hungary and, in her 2008 study of Red fox dentition, Polish Academy of Sciences mammalogist Elwira Szuma suggested that the current line evolved either in Asia Minor or North Africa around this time.As fox populations rose in Eurasia, those in North America appear to have dwindled.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).

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