Today my housemate and co-worker told me about a possible explanation for the prevalence of the gray squirrel in our East Coast North American neighborhoods.
The idea is that before deforestation of the land, squirrels were black in color because this color worked best to camouflage their shape from predators hunting from the sky. As forested areas disappeared, the more gray-colored squirrels survived more frequently. The darker fur stood out more when all the trees were gone. Gray squirrels now dominate our squirrel populations.
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