Sickly shades of grey: Disease outbreaks influence the color of wolves across North America

New research shows that black wolves are more likely to survive outbreaks of canine distemper virus (CDV). Yellowstone Natural Park wolves prefer to mate with those of the opposite color in areas where CDV outbreaks happen to improve the fitness of their offspring. CDV outbreaks may explain why black wolves become more common further south in North America.New research shows that black wolves are more likely to survive outbreaks of canine distemper virus (CDV). Yellowstone Natural Park wolves prefer to mate with those of the opposite color in areas where CDV outbreaks happen to improve the fitness of their offspring. CDV outbreaks may explain why black wolves become more common further south in North America.

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