By David L. Fox
Kingdom:
Animalia
Phylum:
Chordata
Subphylum:
Vertebrata
Class:
Mammalia
Order:
Tubulidentata
Family:
Orycteropodidae
Genus:
Orycteropus
Species:
Orycteropus afer
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Geographic Range
Aardvarks occur throughout much of sub-Saharan Africa with the exception of the rainforests of the west-central parts of the continent.
Biogeographic Regions:
ethiopian
(
native
).
Habitat
Aardvarks occur in a variety of habitats: grassy plains, bushland, woodland, and savanna. The presence of sufficient quantities of ants and termites seems to be the limiting factor.
Terrestrial Biomes:
savanna or grassland
;
scrub forest
.
Physical Description
Mass
<VALUE>40 to 100 kg
(88 to 220 lbs)</VALUE>
Aardvarks have a superficial resemblance to a long snouted pig. The skin is thick, sparsely covered by hairs and varies in color from dull brownish gray to dull yellowish gray. The pinnae of the ears are large (150-210 mm) and can fold back to protect the ears while the aardvark is burrowing. The blunt snout has circular nostrils. The tongue is tapered. The dental formula is usually 0/0 0/0 2/2 3/3 for a total of 20 teeth in the adult. The cheek teeth are composed of numerous hexagonal prisms of dentin, which are perpendicular to the occlusal surface. Each prism is pierced by a tubule that is homologous to the pulp cavity, not the Tomes fibres. This unusual dental structure is the origin for the ordinal and familial names. The cranium is long and relatively low and the mandible is straight and blade-like anteriorly.
Some key physical features:
endothermic
;
bilateral symmetry
.
Reproduction
Aardvarks are thought to be polygamous, in part because only females maintain consistent home ranges. Gestation lasts approximately 7 months and single births are normal, though twinning does occur occasionally. The timing of birth varies across Africa. Neonates weigh between 1.8 and 2 kg and are approximately 550 mm long. Young remain in the burrow for several weeks following birth before venturing out with the mother on nightly foraging trips. Young excavate their own burrows at 6 months old, though they remain in association with the mother until the following mating season. Sexual maturity is attained at 2 years after birth.
Key reproductive features:
gonochoric/gonochoristic/dioecious (sexes separate);
sexual
.
Behavior
Aardvarks are excellent diggers and excavate burrows that are typically 2-3 m long, although they may be much more extensive. In soft earth, an aardvark can dig faster than several humans using shovels. Aardvarks are nocturnal and sleep during the day curled in a tight circle in the burrow. They are solitary and may be territorial. Males and females occupy separate burrows. Within its territory, an aardvark uses the same network of paths over an interval of about a week. While foraging, aardvarks cover a strip of ground about 30 m wide in a zig-zag path with the ears directed forward and the snout close to the ground, emitting snuffling sounds while searching for prey. Aardvarks feed by digging into termite or ant mounds with their powerful forelimbs and lapping up the residents with their sticky tongues, which can be thrust 250-300 mm out of the mouth. An unusual behavior of aardvarks is the burying of feces, which they do regularly in shallow excavations 10cm deep. This may be to avoid detection by other aardvarks.
Key behaviors:
motile
.
Food Habits
The principal food items are ants and termites, which are gathered with the long, sticky tongue. Other insects are occasionally taken, and predation on mice has been reported. Aardvarks also eat the fruit of a wild cucumber, known as the aardvark pumpkin, apparently as a source of water.
Economic Importance for Humans: Negative
Aardvark burrows can cause damage to farmlands and are a hazard to vehicles and horses.
Economic Importance for Humans: Positive
Aardvarks have long been hunted by Africans as well as European colonists for their flesh, hide and for sport. The meat is said to look like coarse beef and taste like pork. Many aardvark parts are valued as charms or curios. Aardvarks are also important as a control on termites.
Ways that people benefit from these animals:
food
; body parts are source of valuable material; controls pest population.
Conservation Status
Aardvarks are listed under CITES Appendix II due to a lack of precise information on its status.
Other Comments
Aardvarks are color blind.
Contributors
David L. Fox (author), University of Michigan.
References
Nowak, R. M. 1991. Walker's Mammals of the World. Johns Hopkins University Press, Baltimore.
Shoshani, J, Goldman, C. A. and Thewissen, J. G. M. 1988. Orycteropus afer. Mammalian Species Account No. 300. American Society of Mammalogists, 8 pp.
Knoethig, J. 2005. "Biology of the Aardvark (Orycteropus afer)" (On-line). Accessed February 11, 2006 at <TT>
http://www.tierseiten.com/roehrenzaehner/aardvark.pdf</TT>.
<TT>2006/04/23 04:15:44.754 GMT-4</TT> <!-- End content -->
To cite this page: Fox, D. 1999. "Orycteropus afer" (On-line), Animal Diversity Web. Accessed April 26, 2006 at
http://animaldiversity.ummz.umich.edu/site/accounts/information/Orycteropus_afer.html.
Disclaimer: The Animal Diversity Web is an educational resource
written largely by and for college students. ADW doesn't cover all species in the world, nor does it include all the latest scientific information about organisms we describe. Though we edit our accounts for accuracy, we cannot guarantee all information in those accounts. While ADW staff and contributors provide references to books and websites that we believe are reputable, we cannot necessarily endorse the contents of references beyond our control.
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