J. Gregory Hockman, Joseph A. Chapman, Comparative Feeding Habits of Red Foxes (Vulpes vulpes) and Gray Foxes (Urocyon cinereoargenteus) in Maryland, The American Midland Naturalist, Vol. 110, No. 2 (Oct., 1983), pp. 276-285
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Hockman et al. (1983) studied this question.
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