The AARDVARK (/ˈɑːrd.vɑːrk/ ARD-vark ;
Orycteropus afer) is a
medium-sized, burrowing, nocturnal mammal native to
* 1 Naming and taxonomy
* 1.1 Naming * 1.2 Taxonomy * 1.3 Evolutionary history * 1.4 Subspecies
* 2 Description
* 2.1 Head * 2.2 Digestive system
* 4 Ecology and behavior
* 4.1 Feeding * 4.2 Vocalization * 4.3 Movement * 4.4 Reproduction
* 5 Conservation * 6 Mythology and popular culture * 7 Footnotes * 8 References * 9 External links
NAMING AND TAXONOMY
The aardvark is sometimes colloquially called "African ant bear",
"anteater" (not to be confused with the South American anteater ), or
the "Cape anteater" after the
Cape of Good Hope
The aardvark is not related to the pig; rather, it is the sole extant
representative of the obscure mammalian order
Tubulidentata , in
which it is usually considered to form one variable species of the
Orycteropus , the sole surviving genus in the family
Based on fossils, Bryan Patterson has concluded that early relatives
of the aardvark appeared in
The first unambiguous tubulidentate was probably Myorycteropus
africanus from Kenyan
The mysterious Pleistocene
The aardvark has seventeen poorly defined subspecies listed:
* Orycteropus afer afer * O. a. adametzi Grote, 1921 * O. a. aethiopicus Sundevall , 1843 * O. a. angolensis Zukowsky "> An aardvark skeleton and mounted individual
The aardvark is vaguely pig-like in appearance. Its body is stout with a prominently arched back and is sparsely covered with coarse hairs. The limbs are of moderate length, with the rear legs being longer than the forelegs. The front feet have lost the pollex (or 'thumb'), resulting in four toes, while the rear feet have all five toes. Each toe bears a large, robust nail which is somewhat flattened and shovel-like, and appears to be intermediate between a claw and a hoof. Whereas the aardvark is considered digitigrade , it appears at time to be plantigrade . This confusion happens because when it squats it stands on its soles.
An aardvark's weight is typically between 60 and 80 kilograms (130–180 lb). An aardvark's length is usually between 105 and 130 centimetres (3.44–4.27 ft), and can reach lengths of 2.2 metres (7 ft 3 in) when its tail (which can be up to 70 centimetres (28 in)) is taken into account. It is 60 centimetres (24 in) tall at the shoulder, and has a girth of about 100 centimetres (3.3 ft). It is the largest member of the proposed clade Afroinsectiphilia . The aardvark is pale yellowish-gray in color and often stained reddish-brown by soil . The aardvark's coat is thin, and the animal's primary protection is its tough skin. Its hair is short on its head and tail; however its legs tend to have longer hair. The hair on the majority of its body is grouped in clusters of 3-4 hairs. The hair surrounding its nostrils is dense to help filter particulate matter out as it digs. Its tail is very thick at the base and gradually tapers.
The greatly elongated head is set on a short, thick neck, and the end of the snout bears a disc, which houses the nostrils. It contains a thin but complete zygomatic arch . The head of the aardvark contains many unique and different features. One of the most distinctive characteristics of the Tubulidentata is their teeth . Instead of having a pulp cavity , each tooth has a cluster of thin, hexagonal, upright, parallel tubes of vasodentin (a modified form of dentine ), with individual pulp canals, held together by cementum . The number of columns is dependent on the size of the tooth, with the largest having about 1,500. The teeth have no enamel coating and are worn away and regrow continuously. The aardvark is born with conventional incisors and canines at the front of the jaw, which fall out and are not replaced. Adult aardvarks have only cheek teeth at the back of the jaw , and have a dental formula of: 0.0.2-18.104.22.168.3 These remaining teeth are peg-like and rootless and are of unique composition. The teeth consist of 14 upper and 12 lower jaw molars. The nasal area of the aardvark is another unique area, as it contains ten nasal conchae , more than any other placental mammal.
The sides of the nostrils are thick with hair. The tip of the snout is highly mobile and is moved by modified mimetic muscles . The fleshy dividing tissue between its nostrils probably has sensory functions, but it is uncertain whether they are olfactory or vibratory in nature. Its nose is made up of more turbinate bones than any other mammal, with between 9 and 11, compared to dogs with 4 to 5. With a large quantity of turbinate bones, the aardvark has more space for the moist epithelium , which is the location of the olfactory bulb. The nose contains nine olfactory bulbs , more than any other mammal. Its keen sense of smell is not just from the quantity of bulbs in the nose but also in the development of the brain, as its olfactory lobe is very developed. The snout resembles an elongated pig snout. The mouth is small and tubular, typical of species that feed on ants and termites . The aardvark has a long, thin, snakelike, protruding tongue (as much as 30 centimetres (12 in) long) and elaborate structures supporting a keen sense of smell . The ears, which are very effective, are disproportionately long, about 20–25 centimetres (7.9–9.8 in) long. The eyes are small for its head, and consist only of rods .
The aardvark's stomach has a muscular pyloric area that acts as a gizzard to grind swallowed food up, thereby rendering chewing unnecessary. Its cecum is large. Both sexes emit a strong smelling secretion from an anal gland. Its salivary glands are highly developed and almost completely ring the neck; their output is what causes the tongue to maintain its tackiness. The female has two pairs of teats in the inguinal region.
Genetically speaking, the aardvark is a living fossil , as its chromosomes are highly conserved, reflecting much of the early eutherian arrangement before the divergence of the major modern taxa .
HABITAT AND RANGE
Aardvarks are found in sub-Saharan
ECOLOGY AND BEHAVIOR
Aardvarks live for up to 23 years in captivity . Its keen hearing warns it of predators: lions , leopards , cheetahs, hunting dogs , hyenas , and pythons . Some humans also hunt aardvarks for meat. Aardvarks can dig fast or run in zigzag fashion to elude enemies, but if all else fails, they will strike with their claws, tail and shoulders, sometimes flipping onto their backs lying motionless except to lash out with all four feet. They are capable of causing substantial damage to unprotected areas of an attacker. They will also dig to escape as they can, when pressed, dig extremely quickly. Their thick skin also protects them to some extent.
The aardvark is nocturnal and is a solitary creature that feeds almost exclusively on ants and termites (formivore ); the only fruit eaten by aardvarks is the aardvark cucumber . In fact, the cucumber and the aardvark have a symbiotic relationship as they eat the subterranean fruit, then defecate the seeds near their burrows, which then grow rapidly due to the loose soil and fertile nature of the area. The time spent in the intestine of the aardvark helps the fertility of the seed, and the fruit provides needed moisture for the aardvark. They avoid eating the African driver ant and red ants. Due to their stringent diet requirements, they require a large range to survive. An aardvark emerges from its burrow in the late afternoon or shortly after sunset, and forages over a considerable home range encompassing 10 to 30 kilometres (6.2 to 18.6 mi). While foraging for food, the aardvark will keep its nose to the ground and its ears pointed forward, which indicates that both smell and hearing are involved in the search for food. They zig-zag as they forage and will usually not repeat a route for 5–8 days as they appear to allow time for the termite nests to recover before feeding on it again.
During a foraging period, they will stop and dig a "V" shaped trench
with their forefeet and then sniff it profusely as a means to explore
their location. When a concentration of ants or termites is detected,
the aardvark digs into it with its powerful front legs, keeping its
long ears upright to listen for predators, and takes up an astonishing
number of insects with its long, sticky tongue—as many as 50,000 in
one night have been recorded. Its claws enable it to dig through the
extremely hard crust of a termite or ant mound quickly. It avoids
inhaling the dust by sealing the nostrils. When successful, the
aardvark's long (up to 30 centimetres (12 in)) tongue licks up the
insects; the termites' biting, or the ants' stinging attacks are
rendered futile by the tough skin. After an aardvark visit at a
termite mound, other animals will visit to pick up all the leftovers.
On a nightly basis they tend to be more active during the first portion of the night time (20:00-00:00); however, they don't seem to prefer bright or dark nights over the other. During adverse weather or if disturbed they will retreat to their burrow systems. They cover between 2 and 5 kilometres (1.2 and 3.1 mi) per night; however, some studies have shown that they may traverse as far as 30 kilometres (19 mi) in a night.
The aardvark is a rather quiet animal. However, it does make soft grunting sounds as it forages and loud grunts as it makes for its tunnel entrance. It makes a bleating sound if frightened. When it is threatened it will make for one of its burrows. If one is not close it will dig a new one rapidly. This new one will be short and require the aardvark to back out when the coast is clear.
The aardvark is known to be a good swimmer and has been witnessed successfully swimming in strong currents. It can dig a yard of tunnel in about five minutes, but otherwise moves fairly slowly.
When leaving the burrow at night, they pause at the entrance for about ten minutes, sniffing and listening. After this period of watchfulness, it will bound out and within seconds it will be 10 metres (33 ft) away. It will then pause, prick its ears, twisting its head to listen, then jump and move off to start foraging.
Aside from digging out ants and termites, the aardvark also excavates
burrows in which to live; of which they generally fall into three
categories: burrows made while foraging, refuge and resting location,
and permanent homes. Temporary sites are scattered around the home
range and are used as refuges, while the main burrow is also used for
breeding. Main burrows can be deep and extensive, have several
entrances and can be as long as 13 metres (43 ft). These burrows can
be large enough for a man to enter. The aardvark changes the layout
of its home burrow regularly, and periodically moves on and makes a
new one. The old burrows are an important part of the African wildlife
scene. As they are vacated, then they are inhabited by smaller animals
African wild dog
Aardvarks pair only during the breeding season; after a gestation period of seven months, one cub weighing around 1.7–1.9 kilograms (3.7–4.2 lb) is born during May–July. When born, the young has flaccid ears and many wrinkles. When nursing, it will nurse off each teat in succession. After two weeks, the folds of skin disappear and after three, the ears can be held upright. After 5–6 weeks, body hair starts growing. It is able to leave the burrow to accompany its mother after only two weeks and eats termites at 9 weeks, and is weaned between three months and 16 weeks. At six months of age, it is able to dig its own burrows, but it will often remain with the mother until the next mating season , and is sexually mature from approximately two years of age.
Aardvarks were thought to have declining numbers, however, this is
possibly due to the fact that they are not readily seen. There are no
definitive counts because of their nocturnal and secretive habits;
however, their numbers seem to be stable overall. They are not
considered common anywhere in Africa, but due to their large range,
they maintain sufficient numbers. There may be a slight decrease in
numbers in eastern, northern, and western Africa. Southern African
numbers are not decreasing. It receives an official designation from
Aardvarks handle captivity well. The first zoo to have one was London
Zoo in 1869, which had an animal from South
MYTHOLOGY AND POPULAR CULTURE
F-14 Tomcat from VF-114 Aardvarks with the squadron mascot painted on the tail
In African folklore , the aardvark is much admired because of its diligent quest for food and its fearless response to soldier ants . Hausa magicians make a charm from the heart, skin, forehead, and nails of the aardvark, which they then proceed to pound together with the root of a certain tree. Wrapped in a piece of skin and worn on the chest, the charm is said to give the owner the ability to pass through walls or roofs at night. The charm is said to be used by burglars and those seeking to visit young girls without their parents' permission. Also, some tribes, such as the Margbetu , Ayanda , and Logo , will use aardvark teeth to make bracelets, which are regarded as good luck charms. The meat, which has a resemblance to pork, is eaten in certain cultures.
The Egyptian god Set is usually depicted with the head of an unidentified animal , whose similarity to an aardvark has been noted in scholarship.
The titular character of Arthur , an animated television series for children based on a book series and produced by WGBH , shown in more than 180 countries, is an aardvark.
Otis the Aardvark was a puppet character used on Children\'s BBC programming.
In the military, the Air Force supersonic fighter-bomber F-111/FB-111
was nicknamed the
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