Red fox fur color ranges from pale yellowish red to deep reddish brown on the upper parts and white, ashy, or slaty on the underside. The lower part of the legs is usually black and the tail usually has a white or black tip. Two other kinds of fur colors are fairly common. Cross foxes have reddish brown fur with a black stripe down the back and another across the shoulders. Silver foxes range from strong silver to nearly black and are the most prized by furriers. These variants are about 25% and 10% of red fox individuals, respectively. Red foxes, like many other Canidae species, have tail glands. The eyes of adult foxes are yellow. The nose is dark brown or black. The length of their jaws is more than half the length of the head. They have sharp canines for grabbing and strong molars for chewing and crushing. They have 5 claws on their front feet and 4 on the rear. Red fox males are larger than females. They range from 827 to 1097 mm in length, with the tail making up 291 to 455 mm of that. They weigh from 3 to 7 kg.
Red foxes are the largest fox species. Head and body length ranges from 455 to 900 mm, tail length from 300 to 555 mm, and weight from 3 to 14 kg. Males are slightly larger than females. Populations in southern deserts and in North America are smaller than European populations.
Range mass: 3 to 14 kg.
Range length: 455 to 900 mm.
Other Physical Features: endothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: male larger
Average basal metabolic rate: 13.731 W.
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