Genetic information from a 35,000-year-old wolf bone found below a frozen cliff in Siberia is shedding new light on humankind's long relationship with dogs, showing canine domestication may have occurred earlier than previously thought.
Today's dogs, from the Chihuahua to the Great Dane, are believed to have descended from wild wolves domesticated by humans in prehistoric times, but when this took place has been a matter of debate.
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