Although they are called flying squirrels, these small mammals do not really fly; they glide using a thin, furred membrane of skin that extends from their wrists to their ankles. Their scientific name, from Greek, means silver-gray (glaukos) mouse (mys). However, their velvet soft fur varies in color, ranging from cinnamon or grayish to reddish-brown or blackish-brown. The northern flying squirrels survival rate is less than thirty percent for juveniles and fifty percent for adults. The average life span is about 3-4 years but some in captivity may live as long as 10 years. There is little known about the squirrels’ social structure, courtship, mating and reproductive behavior since they are nocturnal and may be hard to spot.

Reference: Wikipedia

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