Black Wolves Got Color From Domestic Dogs
Black fur proof of dog legacy
By Peter Fearon,  Newser Staff
Posted Feb 6, 2009 8:16 AM CST
Wolves walk across the frozen shallows of Lake Superior near the shoreline on Isle Royale.    (AP Photo/Michigan Tech University, John Vucetich)
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(Newser) – Researchers have found the genes of dogs in some North American wolves, linked to interbreeding some 15,000 years ago, reports Wired. The black fur of some forest-dwelling wolves is the result of the long-ago matings with dogs, likely kept as companions by American Indians. The dalliances may have strengthened the wolves' immune systems—and their camouflage abilities, researchers believe.

“This is pretty unique,” said a Stanford University biologist, lead author of the study. “Typically, you’d expect gene flow from domestic to wild animals would not be beneficial." There is no evidence of recent interbreeding between dogs and wolves, he noted.