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Fennec fox

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Fennec fox
Fennec fox in Norfolk Zoo
CITES Appendix II (CITES)[1]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Infraorder: Cynoidea
Family: Canidae
Subfamily: Caninae
Tribe: Vulpini
Genus: Vulpes
Species:
V. zerda
Binomial name
Vulpes zerda
(Zimmermann, 1780)
Fennec range

The fennec fox (Vulpes zerda) is a small fox native to the deserts of North Africa, ranging from Western Sahara and Mauritania to the Sinai Peninsula. Its most distinctive feature is its unusually large ears, which serve to dissipate heat and listen for underground prey. The fennec is the smallest fox species. Its coat, ears, and kidney functions have adapted to the desert environment with high temperatures and little water.

The fennec mainly eats insects, small mammals and birds. It has a life span of up to 14 years in captivity and about 10 years in the wild. Pups are preyed upon by the Pharaoh eagle-owl; both adults and pups may possibly fall prey to jackals and striped hyenas. Fennec families dig out burrows in the sand for habitation and protection, which can be as large as 120 m2 (1,300 sq ft) and adjoin the burrows of other families. Precise population figures are not known but are estimated from the frequency of sightings; these indicate that the fennec is currently not threatened by extinction. Knowledge of social interactions is limited to information gathered from captive animals. The fennec fox is commonly trapped for exhibition or sale in North Africa, and it is considered an exotic pet in some parts of the world.

Taxonomy

The fennec fox was scientifically described by Eberhardt Zimmermann in 1780.[2] It was originally assigned to the Canis genus, but following molecular analysis it was moved to Vulpes despite it having a few distinct morphological and behavioral traits.[3] According to DNA evidence, the closest living relative to the fennec fox is the Blanford's fox. They are two of eight "desert fox" species, which is a group of Vulpes that share comparable ecologies. The other members include the corsac fox, pale fox, kit fox, Tibetan fox, Ruppell’s fox and cape fox. All eight species evolved to survive in desert environments, developing several traits such as sandy colored coats, large ears, pigmented eyes, and specialized kidneys.[4] The word fennec is derived from the Arabic word fanak which likely has Persian origins.[5]

The fennec fox is one of 13 extant Vulpes species and a member of the family Canidae.[3] The oldest known fossil species within Vulpes is V. riffautae, dating back to the late Miocene of Chad, which is within the Neogene. The deposits where these fossils are found are about 7 million years old, which might make them the earliest Canidae in the Old World. They are estimated to have weighed between 1.5 and 3.5 lb, slightly larger than fennecs. V. skinneri, from the Malapa Fossil Site from South Africa, is younger than V. riffautae by roughly 5 million years, and shows up in the early Pleistocene.[6][7]

Description

Skull of a fennec fox

The fennec fox has sand-colored fur which reflects sunlight during the day and helps keep it warm at night. Its nose is black and its tapering tail has a black tip. Its long ears have longitudinal reddish stripes on the back and are so densely haired inside that the external auditory meatus is not visible.[8] The edges of the ears are whitish, but darker on the back. The ear to body ratio is the greatest in the canid family and likely helps in dissipating heat and locating vertebrates. It also has large, dense kidneys with somewhat compact medulla, which help store water in times of scarcity. It has dark streaks running from the inner eye to either side of the slender muzzle. Its large eyes are dark. The dental formula is 3.1.4.23.1.4.3 × 2 = 42 with small and narrow canines. The pads of its paws are covered with dense fur, which facilitates walking on hot, sandy soil.[9][10][11]

The fennec fox is the smallest canid species. Females range in head-to-body size from 34.5 to 39.5 cm (13.6 to 15.6 in) with a 23–25 cm (9.1–9.8 in) long tail and 9–9.5 cm (3.5–3.7 in) long ears, and weigh 1–1.9 kg (2.2–4.2 lb). Males are slightly larger, ranging in head-to-body size from 39 to 39.5 cm (15.4 to 15.6 in) with a 23–25 cm (9.1–9.8 in) long tail and 10 cm (3.9 in) long ears, weighing at least 1.3 kg (2.9 lb).[9]

Distribution and habitat

The fennec fox is distributed throughout the Sahara, from Morocco and Mauritania to northern Sudan, through Egypt and its Sinai Peninsula.[1] It inhabits small sand dunes and vast treeless sand areas with sparse vegetation such as grasses, sedges and small shrubs.[9][12] In the northern part of its range annual rainfalls have been recorded at <100 mm compared to 300 mm in its southern range. The fennec fox's range likely overlaps with that of other canines such as the golden jackal and Rüppell’s fox. Compared to these canids, the fennec fox seems to inhabit areas with more extreme climate and has been known to build burrows in grainier surfaces; this adaptation gives it an edge over competitors.[1]

Behaviour and ecology

Behaviour

A fennec fox call
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Fennec fox in the Moroccan Sahara

Fennec foxes are primarily nocturnal, displaying heightened activity during the cooler nighttime hours.[13] This behaviour helps them escape the extreme Saharan heat and reduces water loss through panting.[14] A fennec fox digs its den in sand, either in open areas or places sheltered by plants with stable sand dunes. In compacted soils, dens are up to 120 m2 (1,300 sq ft) large, with up to 15 different entrances. In some cases, different families interconnect their dens, or locate them close together. In soft, looser sand, dens tend to be simpler with only one entrance leading to a single chamber.[9]

Captive individuals reside in family groups consisting of several members. Fennec foxes exhibit playful behavior, especially among younger individuals.[15]

Hunting and diet

The fennec fox is omnivorous, feeding on small rodents, lizards (geckos and skinks), small birds and their eggs, insects, fruits, leaves, roots and also some tubers.[16] It relies on the moisture content of prey, but drinks water when available.[9] It hunts alone and digs in the sand for small vertebrates and insects. Some individuals were observed to bury prey for later consumption and searching for food in the vicinity of human settlements.[17]

In the Algerian Sahara, 114 scat samples were collected that contained more than 400 insects, plant fragments and date palm (Phoenix dactylifera) fruits, remains of birds, mammals, squamata and insects.[18]

Reproduction

Male fennec fox mounting a female

Fennec foxes mate for life.[19] Captive fennec foxes reach sexual maturity at around nine months and mate between January and April.[20][21] Female fennec foxes are in estrus for an average of 24 hours and usually breed once per year; the copulation tie lasts up to two hours and 45 minutes.[22] Gestation usually lasts between 50 and 52 days, though sometimes up to 63 days.[23][24] After mating, the male becomes very aggressive and protects the female, and provides her with food during pregnancy and lactation.[25] Females give birth between March and June to a litter of one to four pups that open their eyes after 8 to 11 days.[24][21] Both female and male care for the pups. They communicate by barking, purring, yapping and squeaking. Pups remain in the family even after a new litter is born.[20] The pups are weaned at the age of 61 to 70 days.[26] Adults rear pups until they are around 16 to 17 weeks old.[19] The average lifespan in the wild is 10 years.[3] The oldest captive male fennec fox was 14 years old, and the oldest female 13 years.[9]

Diseases

Captive fennec foxes are known to be susceptible to canine distemper virus, displaying fever, mucopurulent ocular discharge, diarrhea, severe emaciation, seizures, generalized ataxia, severe dehydration, brain congestion, gastric ulcers and death. Stress because of capture and long-distance transportation are thought to be the causes.[27] In 2012, a study reported a case of Trichophyton mentagrophytes, a fungus species, in a 2-year-old male. It died not too long after contracting the pathogen from anorexia and icterus.[28] A 2019 review of the deaths of fennec foxes due to medical conditions or pathogens at the Bronx and Prospect Park Zoos since 1980 found that the majority of such deaths were attributed to neoplasia and infection. Most foxes developed infections or medical conditions from atopic dermatitis and other dermatologic dliseases, as well as trauma.[29] Animalia parasites known to infect the fennec fox include Capillaria,[30] Toxoplasma gondii,[31] and Angiostrongylus vasorum.[32]

Predators

African horned owl species such as the Pharaoh eagle-owl prey on fennec fox pups. Anecdotal reports exist about jackals and striped hyenas also preying on the fennec fox. But according to nomads, the fennec fox is fast and changes directions so well that even their Salukis are hardly ever able to capture it.[9]

Threats

In North Africa, the fennec fox is commonly trapped for exhibition or sale to tourists. Expansion of permanent human settlements in southern Morocco caused its disappearance in these areas and restricted it to marginal areas. Other factors such as roadwork, seismic surveys, mining, oil fields, commercial expansion and the increased number of human communities in their range are cited as potential threats.[1]

Conservation

As of 2015, the fennec fox is classified as Least concern on the IUCN Red List.[1] It is listed in CITES Appendix II and is protected in Morocco and Western Sahara, Algeria, Tunisia and Egypt, where it has been documented in several protected areas.[1]

In captivity

The fennec fox is bred commercially as an exotic pet.[17] Commercial breeders remove the pups from their mother to hand-raise them, as tame foxes are more valuable. A breeders' registry has been set up in the United States to avoid any problems associated with inbreeding.[33] One measure taken to conserve the species is the placement of individuals in captive environments such as zoos. Educational programs are also promoted to further this initiative. Due to poor diet, captive foxes have been known to grow to abnormally large sizes.[15]

In culture

"A greyscale sketch of a group of long eared foxes on a rocky outcrop in a desert. There is a crumbling brick building to the left and two of the foxes are on lookout."
A sketch of a skulk of fennec foxes by Gustav Mützel, 1876

The fennec fox is the national animal of Algeria.[34] It also serves as the nickname for the Algeria national football team "Les Fennecs".[35]

References

  1. ^ a b c d e f g Wacher, T.; Bauman, K. & Cuzin, F. (2015). "Vulpes zerda". IUCN Red List of Threatened Species. 2015: e.T41588A46173447. doi:10.2305/IUCN.UK.2015-4.RLTS.T41588A46173447.en. Retrieved 19 November 2021.
  2. ^ Wozencraft, W. C. (2005). "Order Carnivora". 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. ^ a b c Castelló, José R. (11 September 2018). Canids of the World: Wolves, Wild Dogs, Foxes, Jackals, Coyotes, and Their Relatives. Princeton University Press. pp. 172, 205. ISBN 978-0-691-17685-7.
  4. ^ Henry, J. David (9 April 2013). Red Fox: The Catlike Canine. Smithsonian Institution. ISBN 978-1-58834-339-0.
  5. ^ "Fennec". Dictionary.com. Retrieved 19 December 2024.
  6. ^ de Bonis, Louis; Peigné, Stéphane; Likius, Andossa; Mackaye, Hassane Taïsso; Vignaud, Patrick; Brunet, Michel; et al. (2007). "The oldest African fox (Vulpes riffautae n. sp., Canidae, Carnivora) recovered in late Miocene deposits of the Djurab desert, Chad". Naturwissenschaften. 94 (7): 575–580. Bibcode:2007NW.....94..575D. doi:10.1007/s00114-007-0230-6. PMID 17361401. S2CID 6073654.
  7. ^ Bartolini Lucenti, Saverio; Madurell-Malapeira, Joan (15 May 2020). "Unraveling the fossil record of foxes: An updated review on the Plio-Pleistocene Vulpes spp. from Europe". Quaternary Science Reviews. 236: 106296. Bibcode:2020QSRv..23606296B. doi:10.1016/j.quascirev.2020.106296. ISSN 0277-3791.
  8. ^ Zimmermann, E.A.W. (1780). "Der Zerda". Geographische Geschichte des Menschen, und der allgemein verbreiteten vierfüßigen Thiere. Vol. II. Enthält ein vollständiges Verzeichniß aller bekannten Quadrupeden. Leipzig: Weygand. pp. 247–248.
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  16. ^ "Vulpes zerda (Fennec)". Animal Diversity Web.
  17. ^ a b Asa, C.S. & Cuzin, F.A. (2013). "Vulpes zerda Fennec Fox". In Kingdon, J.; Happold, D.; Hoffmann, M.; Butynski, T.; Happold, M. & Kalina, J. (eds.). Mammals of Africa. Vol. V: Carnivores, Pangolins, Equids and Rhinoceroses. London, New Delhi, New York, Sydney: Bloomsbury. pp. 74–77. ISBN 978-1-4081-8994-8.
  18. ^ Brahmi, K.; Khechekhouche, E.A.; Mostefaoui, O.; Doumandji, S.; Baziz, B. & Aulagnier, S. (2012). "First quantitative data on the diet of the fennec fox, Vulpes zerda (Canidae, Carnivora), in Algeria". Folia Zoologica. 61: 61–70. doi:10.25225/fozo.v61.i1.a10.2012. S2CID 86211731.
  19. ^ a b Siciliano-Martina, L.; Martina, J. P.; Dohnalik, E.; Vielleux, G. (2023). "Factors influencing the timing and frequency of litters in captive fennec foxes (Vulpes zerda)". Animal Reproduction Science. 248: 107182. doi:10.1016/j.anireprosci.2022.107182. PMID 36529013.
  20. ^ a b Gauthier-Pilters, H. (1967). "The Fennec". African Wildlife. 21: 117–125.
  21. ^ a b Saint Girons, M. C. (1962). "Notes sur les dates de reproduction en captivite du fennec, Fennecus zerda (Zimmerman, 1780)" (PDF). Zeitschrift für Säugetierkunde (in French). 27: 181–184.
  22. ^ Valdespino, C.; Asa, C. S. & Bauman, J. E. (2002). "Estrous cycles, copulation and pregnancy in the fennec fox (Vulpes zerda)" (PDF). Journal of Mammalogy. 83 (1): 99–109. doi:10.1644/1545-1542(2002)083<0099:ECCAPI>2.0.CO;2. S2CID 51812228.
  23. ^ Petter, F. (1957). "La reproduction du fennec". Mammalia. 21: 307–309.
  24. ^ a b Gangloff, L. (1972). "Breeding fennec foxes Fennecus zerda at Strasbourg Zoo". International Zoo Yearbook. 12 (1): 115–116. doi:10.1111/j.1748-1090.1972.tb02289.x.
  25. ^ Sowards, R. K. (1981). "Observation on breeding and rearing the fennec fox (Fennecus zerda) in captivity". Animal Keepers' Forum. 8: 175–177.
  26. ^ Koenig, L. (1970). "Zur Fortpflanzung und Jungendentwicklung des Wüstenfuchses (Fennecus zerda Zimm. 1780)". Zeitschrift für Tierpsychologie (in German). 27 (2): 205–246. doi:10.1111/j.1439-0310.1970.tb01873.x. S2CID 84068292.
  27. ^ Woo, G.-H.; Jho, Y.-S.; Bak, E.-J. (2010). "Canine distemper virus infection in Fennec Fox (Vulpes zerda)". Journal of Veterinary Medical Science. 72 (8): 1075–1079. doi:10.1292/jvms.09-0510. PMID 20299771.
  28. ^ Pressanti, Charline; Delverdier, Maxence; Iriart, Xavier; Morcel, Frédérique; Cadiergues, Marie-Christine (2012). "A case of Trichophyton mentagrophytes infection in a fennec fox (Vulpes zerda)". Veterinary Dermatology. 23 (5): 456–e87. doi:10.1111/j.1365-3164.2012.01077.x. ISSN 1365-3164. PMID 22822716.
  29. ^ Figueroa, Rachael; Oliveira, Ryan D.; Sykes, John M. (July 2023). "A 40-year (1980–2019) Retrospective review of morbidity and mortality of fennec foxes (Vulpes Zerda) at the Bronx and Prospect Park Zoos". Journal of Zoo and Wildlife Medicine. 54 (2): 252–261. doi:10.1638/2022-0167. ISSN 1042-7260. PMID 37428687. Archived from the original on 11 December 2024.
  30. ^ Taki, Yahya; Bourquia, Maria (30 April 2024). "Gastrointestinal and respiratory parasites in captive mammals at Rabat zoo, with the first record of Capillaria spp. in the Fennec fox (Vulpes zerda)". Veterinaria Italiana. 59 (3). doi:10.12834/VetIt.2856.19877.2. ISSN 1828-1427. PMID 38686838.
  31. ^ Kottwitz, Jack J.; Preziosi, Diane E.; Miller, Margaret A.; Ramos-Vara, Jose A.; Maggs, David J.; Bonagura, John D. (1 November 2004). "Heart Failure Caused by Toxoplasmosis in a Fennec Fox (Fennecus zerda)". Journal of the American Animal Hospital Association. 40 (6): 501–507. doi:10.5326/0400501. ISSN 0587-2871. PMID 15533972.
  32. ^ Galietta, Valentina; Eleni, Claudia; Raso, Caterina; Cocumelli, Cristiano; Friedrich, Klaus G.; Di Cerbo, Pilar; Iurescia, Manuela; Diaconu, Elena L.; Alba, Patricia; De Liberato, Claudio (September 2022). "Systemic Infection by Angiostrongylus vasorum in a Fennec (Vulpes zerda) in an Italian Zoological Garden". Pathogens. 11 (9): 965. doi:10.3390/pathogens11090965. ISSN 2076-0817. PMC 9505467. PMID 36145397.
  33. ^ Roots, C. (2007). Domestication. Westport: Greenwood. pp. 113–114. ISBN 978-0-313-33987-5.
  34. ^ Hodges, K. (2012). "National Animals of African Countries". Archived from the original on 25 February 2014. Retrieved 19 February 2014.
  35. ^ Fifa (2009). "Paris salutes Les Fennecs". Fifa. Archived from the original on 1 June 2010.
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