Rüppell's fox

Rüppell's fox (Vulpes rueppellii), also called Rüppell's sand fox, is a fox species living in desert and semi-desert regions of North Africa, the Middle East, and southwestern Asia. It has been listed as Least Concern on the IUCN Red List since 2008.[1] It is named after the German naturalist Eduard Rüppell.[3]

Rüppell's fox
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Canidae
Genus: Vulpes
Species:
V. rueppellii[2]
Binomial name
Vulpes rueppellii[2]
(Schinz, 1825)[3]
Rüppell's fox range

Description
Skull
Comparison between the skulls of a red fox (left) and a Rüppell's fox (right)

Rüppell's fox is a small fox, measuring 66 to 74 cm (26 to 29 in) in total length, including a tail measuring 27–30 cm (11–12 in) long. There is no pronounced sexual dimorphism, but males appear slightly larger than females. Both sexes are reported to have an average weight of 1.7 kg (3.7 lb).[4] The coat is sandy in color, ticked with numerous white hairs, and fading from reddish along the middle of the back to pure white on the animal's underparts and on the tip of its tail. The flanks are also paler. The head has a more rusty tone on the muzzle and forehead, with dark brown patches on the sides of the muzzle, stretching up towards the eyes. The chin and the sides of the face are white. The whiskers are long, reaching 7 cm (2.8 in).[4]

Its relatively small legs are beige to fawn in color, with individual black hairs that turn lighter to white towards the legs. The soles are heavily coated with fur that fully covers the pads, an adaptation to extremes of temperature in the desert,[5] that probably helps to distribute its weight and move easily on sand. The back has a black speckling, resulting in a thick black patch at the base of the tail, which is bushy with a white tip. The fur is very soft and fluffy in two coats, a heavier denser winter coat and a thinner summer coat.[6] The females have three pairs of mammae.[7]

Similar to other desert-dwelling foxes, Rüppell's fox has large ears to cool it off. Although adults are too large to confuse with fennec foxes, which live in the same area, young Rüppell's foxes can be confused with adults of that species. The larger ears, however, make them easy to distinguish from red and pale foxes, which also live in some the same areas. In addition, the coat of a Rüppell's fox is much paler than that of a red fox, while pale foxes lack the white tips on their tails.[4]

Rüppell's fox has 2n = 40 chromosomes.[6]

Distribution and habitat

Rüppell's fox is found in the deserts of North Africa south of the Atlas Mountains, from Mauritania and Morocco in the west to Egypt and Djibouti in the east. The species is also found in Algeria, central Niger, Libya, northern Chad, Egypt, southern Sudan, the arid lowlands of Ethiopia and northern Somalia.[4] It is common in Arabia, except on the coast of the Red Sea and in the mountainous outskirts. It is also found in the Arabian Peninsula southwards from Syria, Palestine, Jordan and Iraq, and as far east as Iran, Pakistan, and Afghanistan. Within this region, it prefers sandy or rocky deserts, but may also be found in semiarid steppes and sparse scrub.[1]

It is assumed that the distribution areas have changed historically with desertification and are mainly limited by competition with the red fox (Vulpes vulpes) and by human settlements.[1] In 2007, an expansion of the occurrence of foxes in the United Arab Emirates was documented through the first sighting of the species in Al Dhafra in the Emirate of Abu Dhabi.[8] It seems to avoid the extreme arid regions in the middle of the Sahara, being more abundant on the fringes, in mountain massifs and near oases.[6] Annual rainfall in the region of distribution of the species is normally between 100 and a maximum of 240 mm per year, mostly on the northern edge of the Sahara with a maximum of 150 mm per year.[9]

Behavior and ecology

Rüppell's foxes are monogamous and either crepuscular or nocturnal. They usually spend the day resting in their underground dens, but in winter they are occasionally active during the day.[9] They use two different types of burrows, which are strictly separated: the breeding dens and the resting dens.[4] Outside of the breeding season, these are small dens that can hold only one adult fox, and the fox changes dens frequently, on average about every 4.7 days.[10] Breeding dens are larger, and occupied by a pair of adults and their kits. Such dens can sometimes have more than one entrance, although this is unusual.[11] They make a series of short barks during mating and, at other times, can also produce hisses, trills, and sharp whistles. They have been reported to wag their tails, like domestic dogs.[4]

Rüppell's foxes occupy distinct territories, which they mark with urine, but not with dung as red foxes do. The territories of the members of a mated pair overlap almost completely, but are entirely separate from those of any neighboring pairs. These territories are maintained throughout the year, although the pair occupy separate dens outside of the mating season. The size of the territories varies with the local terrain, but has been reported as around 70 km2 (27 sq mi) in Oman, with those of males being larger, on average, than those of females.[11] The foxes range widely during their nocturnal foraging, travelling over 9 km (5.6 mi) in a night.[4]

Its only natural predators are the steppe eagle and the eagle-owl.[4]

Diet

Rüppell's foxes are omnivores, with a diet that varies considerably depending on what is locally available.[5] In some regions, they are reported to be mainly insectivorous, especially feeding on beetles and orthopterans, while in others, small mammals, lizards, and birds form a larger part of their diet. Plants eaten include grasses and desert succulents, along with fruits such as dates, and they have also been known to scavenge from human garbage.[4][11]

Reproduction

Mating occurs in November, a few weeks after the female has prepared her breeding den. Litters up to six kits, although more usually just two or three, are born after a gestation period around 52–53 days. The young are born blind.[4] They reach independence at about four months, when they may travel up to 48 km (30 mi) in search of a suitable territory. They can live an average of seven years in the wild, but have been reported to live up to 12 years in captivity.[4]

Subspecies

Although some authors consider Rüppell's fox to be monotypic, others list up to five subspecies:[2]

  • V. r. caesia
  • V. r. cyrenaica
  • V. r. rueppelli
  • V. r. sabaea
  • V. r. zarudneyi

Philately

The Libyan General Posts and Telecommunications Company (GPTC), in cooperation with the World Wide Fund for Nature, dedicated a postal stamp issue to Rüppell's fox on May 1, 2008. The issue is made of a set of four stamps printed in minisheets of two sets. The issue was completed with a special first day of issue cover having a special postmark.[12]

References
  1. Mallon, D.; Murdoch, J.D. & Wacher, T. (2015). "Vulpes rueppelli". IUCN Red List of Threatened Species. 2015: e.T23053A46197483.
  2. Wozencraft, W.C. (2005). "Species Vulpes rueppellii". In Wilson, D.E.; Reeder, D.M (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 532–628. ISBN 978-0-8018-8221-0. OCLC 62265494.
  3. Schinz, H. R. (1825). "Rüppel'scher Hund. Canis Rüppelii". In Cuvier, G.; Schinz, H. R. (eds.). Das Thierreich, eingetheilt nach dem Bau der Thiere als Grundlage ihrer Naturgeschichte und der vergleichenden Anatomie von den Herrn Ritter von Cuvier. IV. Stuttgart und Tübingen: J.G. Cotta'sche Buchhandlung. pp. 508–509.
  4. Larivière, S. & Seddon, P.J. (2001). "Vulpes rueppelli" (PDF). Mammalian Species. 678 (678): 1–5. doi:10.1644/1545-1410(2001)678<0001:VR>2.0.CO;2. Archived from the original (PDF) on 2005-10-30.
  5. Sheldon, Jennifer W. (1992). Wild dogs : the natural history of the non-domestic Canidae. San Diego: Academic Press. pp. 184–188. ISBN 0-12-639375-3.
  6. Cuzin, F.; Lenain, D.M. (2004). "Rüppel's fox" (PDF). In Sillero-Zubiri, C.; Hoffmann, M.; Macdonald, D.W. (eds.). Canids: foxes, wolves, jackals, and dogs : status survey and conservation action plan. Gland, Switzerland: IUCN/SSC. pp. 201–205. ISBN 2-8317-0786-2. Archived from the original (PDF) on 2007-10-12.
  7. Kingdon, Jonathan (20 November 2014). "Superorder Ferae". Mammals of Africa. Volume V: Carnivores, Pangolins, Equids and Rhinoceroses. London: A&C Black. pp. 67–69. ISBN 978-1-4081-8994-8.
  8. Murdoch, J. D.; Drew, C.; Llanes, Ingrid B.; Tourenq, C. (2007). Sillero, Claudio; Macdonald, David (eds.). Rüppell's foxes in Al Dhafra, United Arab Emirates (PDF). Canid News (Report). 10. ISSN 1478-2677. Retrieved 9 November 2020.
  9. Sillero-Zubiri, Claudio (2009). "Rüppel's Fox Vulpes rueppellii". In Mittermeie, Russell A.; Wilson, Don E. (eds.). Handbook of the mammals of the world. 1. Carnivores. Barcelona: Lynx Edicions. ISBN 978-84-96553-49-1.
  10. Nowak, Ronald M. (2005). Walker's carnivores of the world. Baltimore: Johns Hopkins University Press. p. 78. ISBN 9780801880339.
  11. Lindsay, I.M. & Macdonald, D.W. (1986). "Behaviour and ecology of the Rüppell's fox Vulpes rueppelli, in Oman". Mammalia. 50 (4): 461–474. doi:10.1515/mamm.1986.50.4.461. S2CID 84472688.
  12. "libyan-stamps.com". www.libyan-stamps.com. Archived from the original on 2009-03-03. Retrieved 2017-09-21.
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