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The gene that is responsible for the dark or melanistic phase of a red fox is apparently pleiotropic (responsible for many traits) because melanistic red fox have larger tails, extra hair on the bottom of their paws, and thick curly ventral (chest and abdominal) hair. Although the "cross fox" has a unique appearance and characteristics, they are the same species as the "red fox" (Vulpes vulpes).
red foxmorphcrossvulpesmammalwildlifegrand teton national parkwyoming