dave, to answer your question, i understand that mountains separate unicolor populations from the blacktails. unicolors have smokey colored tails at birth but by adulthood, they have earned their name. blacktails usually have jet black tails at birth. i don't know what that is in your pic but apparently there is alot of gray area w/ this taxa. below are pics of new born unicolors & what they look like about 5 years down the road. & also an adult blacktail....

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