Photo: Wolf-Dog Mating Led to Darker Wolves



Light- and dark-furred pups howl in Indiana's Wolf Park in an undated picture.

A sprinkling of dog genes thousands of years ago may have given North American gray wolves a "selective advantage" by giving some of them darker coats, a February 2009 study says.

Photograph courtesy Monty Sloan; Wolf Park, Battle Ground, Indiana, via Science


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