Eastern Gray Squirrel

According to wikipedia: As a melanistic variety of the eastern grey squirrel, individual black squirrels can exist wherever grey squirrels live. Grey mating pairs may produce black offspring, and in areas with high concentrations of black squirrels, mixed litters are common.[1] The black subgroup seems to have been dominant throughout North America prior to the arrival of Europeans in the 16th century, since their dark colour helped them hide in virgin forests which tended to be very dense and shaded. As time passed, hunting and deforestation led to biological advantages for grey coloured individuals.[2] Today, the black subgroup is particularly abundant in the northern part of the Eastern Grey Squirrel's range.[3][4] This is likely due to the significantly increased cold tolerance of black individuals which lose less heat than greys.[5] Black individuals also enjoy visibility advantages in denser northern forests.[1]