Kit fox

For other uses, see Kit (disambiguation).

The kit fox (Vulpes macrotis) is a fox species of North America. Its range is primarily in the southwestern United States and northern and central Mexico. Some mammalogists classify it as conspecific with the swift fox, V. velox, but molecular systematics imply that the two species are distinct.

Kit fox
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Conservation status
Least Concern  (IUCN 3.1)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Carnivora
Family:	Canidae
Genus:	'Vulpes'
Species:	''V. macrotis''
Binomial name
Vulpes macrotis Merriam, 1888
Kit fox range
Synonyms
arizonensis Goldman, 1931 arsipus Elliot, 1904 devius Nelson and Goldman, 1909 muticus Merriam, 1902 neomexicanus Merriam, 1903 nevadensis Goldman, 1931 tenuirostris Nelson and Goldman, 1931 zinseri Benson, 1938

Range

The northernmost part of its range is the arid interior of Oregon. Its eastern limit is southwestern Colorado. It can be found south through Nevada, Utah, southeastern California, Arizona, New Mexico, and into western Texas.

Subspecies

The endangered San Joaquin kit fox (Vulpes macrotis mutica) was formerly very common in the San Joaquin Valley and through much of Central California. Its 1990 population was estimated to be 7,000. This species is still endangered, after nearly 50 years of being on the Endangered Species List. Officially this species was listed March 3, 1967. On September 26, 2007, Wildlands Inc. announced the designation of the 684-acre (2.77 km²) Deadman Creek Conservation Bank, which is intended specifically to protect habitat of the San Joaquin kit fox. However, the population continues to decline mostly due to heavy habitat loss. Other factors include competition from red fox, and the extermination of the gray wolf from California has left the coyote as the dominant meso-predator in kit fox territory bringing an unbalance in ecosystem relationships. One park where San Joaquin kit foxes can be found, Carrizo Plains National Monument allows coyote hunting which can contribute to kit fox loss because of a lack of understanding of the differences between these two species of Canidae.

The Southern California kit fox (V. m. macrotis) was a population of kit foxes native to desert regions of Southern California which became extinct in 1903.

The desert kit fox (V. m. arsipus) lives in the Mojave Desert.

Appearance

The kit fox is the smallest species of the family Canidae found in North America. It has large ears, between 71 and 95 mm (2.8 and 3.75 in), that help the fox lower its body temperature and give it exceptional hearing (much like those of the fennec fox). This species exhibits sexual dimorphism, with the male being slightly larger. The average species weight is between 1.6 and 2.7 kg (3.5 and 6.0 lbs). The body length is 455 to 535 mm (18 to 21 in). The tail adds another 250–340 mm (9.85–13.4 in) to its length.

It usually has a gray coat, with rusty tones, and a black tip to its tail. Unlike the gray fox, it has no stripe along the length of its tail. Its color ranges from yellowish to gray, and the back is usually darker than the majority of its coat; its belly and inner ears are usually lighter. It has distinct dark patches around the nose.

Diet

The kit fox is mostly a nocturnal animal, but sometimes ventures out of its den during the day. It usually goes out to hunt shortly after sunset, mostly eating small animals such as kangaroo rats, cottontail rabbits, black-tailed jackrabbits (Lepus californicus), meadow voles, hares, prairie dogs, insects, lizards, snakes, fish, and ground-dwelling birds. It will scavenge carrion. While primarily carnivorous, if food is scarce, it has been known to eat tomatoes (Lycopersicon esculentum), cactus fruits (Carnegiea gigantea) and other fruits. Different kit fox families can occupy the same hunting grounds, but do not generally go hunting at the same time.

Habitat

Kit foxes favor arid climates, such as desert scrub, chaparral, and grasslands. Good examples of common habitats are sagebrush Artemisia tridentata and saltbrush Atriplex polycarpa. They can be found in urban and agricultural areas, too. They are found at elevations of 400 to 1,900 meters (1,300 to 6,200 feet) above sea level.

Mating

Template:See also Male and female kit foxes usually establish monogamous mating pairs during October and November. Polygamous mating relationships have been observed. Pairs can change year to year. They mate from December to February, when they use larger family dens. Litters are born throughout March and April, usually containing one to seven pups, and average four pups. The gestation is 49 to 55 days. Pups do not leave the den until they are four weeks old. They are weaned after about eight weeks and become independent at five to six months old. They become sexually mature at 10 months. Both parents take part in raising and protecting their young. The average lifespan of a wild kit fox is 5.5 years. In captivity, they can live 12 years. One California study of 144 kit fox pups showed a 74% mortality rate in pups within the first year.

External links

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• ARKive – images and movies of the kit fox (Vulpes macrotis)