What reliable field mark distinguishes the gray fox's tail tip coloration from that of the red fox?

Answer

Black tip

A key distinguishing physical feature is that the gray fox consistently exhibits a black tail tip, whereas the red fox typically has a white tail tip.

What reliable field mark distinguishes the gray fox's tail tip coloration from that of the red fox?

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Not All Foxes Are Foxes - YouTube

classificationcanidfoxGray Fox