Past illnesses may account for variations in coat colors and represent a visual indicator of the strength of wolves immune systems.
A team of researchers resolved to scrutinize the “fitness” theory of wolf fur because of the realization that one of the same genes that influences the coat color of wolves,Assessing populations from across North America, and in Yellowstone National Park in particular, the team revealed that black wolves retain a stronger resistance to, an acute and frequently fatal infection from the same family of viruses that causes measles and mumps.
Not only that, the team also found that wolves with black fur, as opposed to gray, were much more prevalent in areas with frequent flare-ups of CDV, supporting the theory that these wolves are more immune to some illnesses.To solidify their findings further, the researchers then turned to Yellowstone National Park.
In fact, this selective mating manifests in a preference for black-gray pairings, which, according to the team, are observed much more in Yellowstone — where outbreaks appear at intervals of five years-or-so — than in areas with fewer spates of sickness.
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