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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.According to Derek Yalden’s fascinating book, , post-glacial remains of the Red fox have been found at several sites around Britain and suggest that this species re-appeared ‘naturally’ (i.e.According to Wang and Tedford, the first true foxes appeared in North America late in the Miocene (around 9 mya) and were represented by a small Californian species known as , which was found in the Central African country of Chad and dates to the late Miocene (some 7 mya).Recent work by Louis de Bonis and colleagues at the Université de Poitiers in France has suggested that the foxes and other canids first spread throughout Africa, before invading Europe via a trans-Mediterranean route towards the end of the Miocene.Nonetheless, taxonomists (those who study how species are related to each other) currently think that the carnivorans evolved from animals called miacids, which were small tree-living mammals that looked similar to modern-day civets.At some point -- by current thinking, around 42 million years ago (mya), during the mid-Eocene -- it appears that the carnivorans split into the two groups, or suborders, that we recognise as cat-like (Feliformia) and dog-like (Caniformia).A couple of million years later the dogs started arriving in Eurasia, and the Pliocene (4-5 mya) saw the dogs spread into Africa and South America.Around six mya, the first wolf-like dog arrived in western Europe.

In Britain, remains of the Red fox have been found in Wolstonian Glacial sediments from Warwickshire, suggesting that they were around between 330,000 and 135,000 years ago.

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.

If, at this point, you’re wondering where mammals like mustelids, seals, bears, etc. The evolutionary history of the dog family is still not completely resolved (and may never be, as new fossil finds and molecular techniques offer new insights), but the following is a generally accepted hypothesis.

Readers interested in a more detailed appraisal of dog evolution are directed to Xiaoming Wang and Richard Tedford’s authoritative account in their 2008 book and I recommend the reader visits Wiki Pedia and The Searching Wolf.

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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.

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