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Honey badger

"Ratel" redirects here. For other uses, see Honey Badger (disambiguation) and Ratel (disambiguation).

Honey badger
Temporal range: middle Pliocene – Recent
at Satara camp in Kruger National Park, South Africa.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Mustelidae
Subfamily: Mellivorinae
Genus: Mellivora
Species:
M. capensis
Binomial name
Mellivora capensis
(Schreber, 1776)
Map
Ratel distribution
  Extant (resident)

The honey badger (Mellivora capensis), also known as the ratel (/ˈrɑːtəl/ or /ˈreɪtəl/), is a mammal widely distributed in Africa, Southwest Asia, and the Indian subcontinent. Because of its wide range and occurrence in a variety of habitats, it is listed as Least Concern on the IUCN Red List.

It is the only living species in the genus Mellivora and in the mustelid subfamily Mellivorinae. Despite its name, the honey badger does not closely resemble other badger species; instead, it bears more anatomical similarities to weasels. It is primarily a carnivorous species and has few natural predators because of its thick skin, strength and ferocious defensive abilities.

Taxonomy

Viverra capensis was the scientific name used by Johann Christian Daniel von Schreber in 1777 who described a honey badger skin from the Cape of Good Hope.[2] Mellivorae was proposed as name for the genus by Gottlieb Conrad Christian Storr in 1780.[3] Mellivorina was proposed as a tribe name by John Edward Gray in 1865.[4]

The honey badger is the only species of the genus Mellivora. Although in the 1860s it was assigned to the badger subfamily, the Melinae, it is now generally agreed that it bears few similarities to the Melinae. It is much more closely related to the marten subfamily, Guloninae, and furthermore is assigned its own subfamily, Mellivorinae.[5] Differences between Mellivorinae and Guloninae include differences in their dentition formulae. Though not in the same subfamily as the wolverines, which are a genus of large-sized and atypical Guloninae, the honey badger can be regarded as another, analogous, form of outsized weasel or polecat.

Evolution

The species first appeared during the middle Pliocene in Asia.[6] A number of extinct relatives are known dating back at least 7 million years to the Late Miocene. These include Mellivora benfieldi from South Africa and Italy, Promellivora from Pakistan, and Howellictis from Chad. More distant relatives include Eomellivora, which evolved into several different species in both the Old and New World, and the giant, long-legged Ekorus from Kenya.[7]

Subspecies

In the 19th and 20th centuries, 16 zoological specimens of the honey badger were described and proposed as subspecies.[8] As of 2005, 12 subspecies are recognised as valid taxa.[9] Points taken into consideration in assigning different subspecies include size and the extent of whiteness or greyness on the back.[10]

Subspecies and authority Description Range Synonyms
Cape ratel (M. c. capensis) (Schreber, 1776)

South and southwestern Africa mellivorus (Cuvier, 1798)

ratel (Sparrman, 1777)
typicus (Smith, 1833)
vernayi (Roberts, 1932)

Indian ratel (M. c. indica) (Kerr, 1792)

Distinguished from capensis by its smaller size, paler fur and having a less distinct lateral white band separating the upper white and lower black areas of the body[11] Western Middle Asia northward to the Ustyurt Plateau and eastward to Amu Darya. Outside the former Soviet Union, its range includes Afghanistan, Iran (except the southwestern part), western Pakistan and western India mellivorus (Bennett, 1830)

ratel (Horsfield, 1851)
ratelus (Fraser, 1862)

Nepalese ratel (M. c. inaurita) (Hodgson, 1836) Distinguished from indica by its longer, much woollier coat and having overgrown hair on its heels[12] Nepal and contiguous areas east of it
White-backed ratel (M. c. leuconota) (Sclater, 1867) The entire upper side from the face to half-way along the tail is pure creamy white with little admixture of black hairs[13] West Africa, southern Morocco, former French Congo
Black ratel (M. c. cottoni) (Lydekker, 1906)

The fur is typically entirely black, with thin and harsh hairs.[13] Ghana, northeastern Congo sagulata (Hollister, 1910)
Lake Chad ratel (M. c. concisa) (Thomas and Wroughton, 1907) The coat on the back consists largely of very long, pure white bristle-hairs amongst long, fine, black underfur. Its distinguishing feature from other subspecies is the lack of the usual white bristle-hairs in the lumbar area[13] Sahel and Sudan zones, as far as Somaliland brockmani (Wroughton and Cheesman, 1920)

buchanani (Thomas, 1925)

Speckled ratel (M. c. signata) (Pocock, 1909) Although its pelage is the normal dense white over the crown, this pale colour starts to thin out over the neck and shoulders, continuing to the rump where it fades into black. It possesses an extra lower molar on the left side of the jaw[13] Sierra Leone
Ethiopian ratel (M. c. abyssinica) (Hollister, 1910) Ethiopia
Persian ratel (M. c. wilsoni) (Cheesman, 1920) Southwestern Iran and Iraq
Kenyan ratel (M. c. maxwelli) (Thomas, 1923) Kenya
Arabian ratel (M. c. pumilio) Pocock, 1946[14] Hadhramaut, southern Arabia
Turkmenian ratel (M. c. buechneri) Baryshnikov, 2000 Similar to the subspecies indica and inaurita, but is distinguished by its larger size and narrower postorbital constriction[15] Turkmenistan

Description

Skull
Skeleton

The honey badger has a fairly long body, but is distinctly thick-set and broad across the back. Its skin is remarkably loose, and allows the animal to turn and twist freely within it.[16] The skin around the neck is 6 mm (0.24 in) thick, an adaptation to fighting conspecifics.[17] The head is small and flat, with a short muzzle. The eyes are small, and the ears are little more than ridges on the skin,[16] another possible adaptation to avoiding damage while fighting.[17]

The honey badger has short and sturdy legs, with five toes on each foot. The feet are armed with very strong claws, which are short on the hind legs and remarkably long on the forelimbs. It is a partially plantigrade animal whose soles are thickly padded and naked up to the wrists. The tail is short and is covered in long hairs, save for below the base.

The honey badger is the largest terrestrial mustelid in Africa. Adults measure 23 to 28 cm (9.1 to 11.0 in) in shoulder height and 55–77 cm (22–30 in) in body length, with the tail adding another 12–30 cm (4.7–11.8 in). Females are smaller than males.[16] In Africa, males weigh 9 to 16 kg (20 to 35 lb) while females weigh 5 to 10 kg (11 to 22 lb) on average. The mean weight of adult honey badgers from different areas has been reported at anywhere between 6.4 to 12 kg (14 to 26 lb), with a median of roughly 9 kg (20 lb), per various studies. This positions it as the third largest known badger, after the European badger and hog badger, and fourth largest extant terrestrial mustelid after additionally the wolverine.[8][18][19][20][21] However, the average weight of three wild females from Iraq was reported as 18 kg (40 lb), about the typical weight of male wolverines or male European badgers in late autumn, indicating that they can attain much larger than typical sizes in favorable conditions.[22][23] However, an adult female and two males in India were relatively small weighing 6.4 kg (14 lb) and a median of 8.4 kg (19 lb).[8] Skull length is 13.9–14.5 cm (5.5–5.7 in) in males and 13 cm (5.1 in) for females.[24]

There are two pairs of mammae.[25] The honey badger possesses an anal pouch which, unusual among mustelids, is eversible,[26] a trait shared with hyenas and mongooses. The smell of the pouch is reportedly "suffocating", and may assist in calming bees when raiding beehives.[27]

Dentition of the honey badger

The skull greatly resembles a larger version of that of a marbled polecat.[28] The dental formula is: 3.1.3.13.1.3.1. The teeth often display signs of irregular development, with some teeth being exceptionally small, set at unusual angles or absent altogether. Honey badgers of the subspecies signata have a second lower molar on the left side of their jaws, but not the right. Although it feeds predominantly on soft foods, the honey badger's cheek teeth are often extensively worn. The canine teeth are exceptionally short for carnivores.[29] The papillae of the tongue are sharp and pointed, which assists in processing tough foods.[30]

The winter fur is long, being 40–50 mm (1.6–2.0 in) long on the lower back, and consists of sparse, coarse, bristle-like hairs, with minimal underfur. Hairs are even sparser on the flanks, belly and groin. The summer fur is shorter (being only 15 mm (0.59 in) long on the back) and even sparser, with the belly being half bare. The sides of the head and lower body are pure black. A large white band covers the upper body, from the top of the head to the base of the tail.[31] Honey badgers of the cottoni subspecies are unique in being completely black.[13]

Distribution and habitat

The honey badger ranges through most of sub-Saharan Africa, from the Western Cape, South Africa, to southern Morocco and southwestern Algeria and outside Africa through Arabia, Iran, and Western Asia to Turkmenistan and the Indian Peninsula. It is known to range from sea level to as much as 2,600 m (8,500 ft) in the Moroccan High Atlas and 4,000 m (13,000 ft) in Ethiopia's Bale Mountains.[1]

Behaviour and ecology

Adult carrying a pup in the Kgalagadi Transfrontier Park, South Africa

The honey badger is mostly solitary, but has also been sighted in Africa to hunt in pairs during the breeding season in May. It also uses old burrows of aardvark, warthog and termite mounds.[30] It is a skilled digger, able to dig tunnels into hard ground in 10 minutes. These burrows usually have only one entry, are usually only 1–3 m (3 ft 3 in – 9 ft 10 in) long with a nesting chamber that is not lined with any bedding.[32]

The honey badger is famous for its strength, ferocity and toughness. It is known to savagely and fearlessly attack almost any other species when escape is impossible, reportedly even repelling much larger predators such as lion and hyena.[33] Bee stings, porcupine quills, and animal bites rarely penetrate their skin. If horses, cattle, or Cape buffalos intrude upon a honey badger's burrow, it will attack them.[29] In the Cape Province it is a potential prey species of the African leopard[34][35] and African rock pythons.[8][36]

Diet

Indian honey badger drinks from a natural stream

The honey badger has the least specialised diet of the weasel family next to the wolverine.[17] It accesses a large part of its food by digging it out of burrows.[8] It often raids beehives in search of both bee larvae and honey.[37] It also feeds on insects, frogs, tortoises, turtles, lizards, rodents, snakes, birds and eggs. It also eats berries, roots and bulbs.[8] When foraging for vegetables, it lifts stones or tears bark from trees. Some individuals have even been observed to chase away lion cubs from kills.[30] It devours all parts of its prey, including skin, hair, feathers, flesh and bones, holding its food down with its forepaws.[38] It feeds on a wide range of animals and seems to subsist primarily on small vertebrates. Honey badgers studied in Kgalagadi Transfrontier Park preyed largely on geckos and skinks (47.9% of prey species), gerbils and mice (39.7% of prey). The bulk of its prey comprised species weighing more than 100 g (3.5 oz) such as cobras, young African rock python and South African springhare.[39] In the Kalahari, honey badgers were also observed to attack domestic sheep and goats, as well as kill and eat black mambas.[36][40] A honey badger was suspected to have broken up the shells of tent tortoises in the Nama Karoo.[41] In India, honey badgers are said to dig up buried human corpses.[42]

Despite popular belief, there is no evidence that honeyguides guide the honey badger.[43]

Reproduction

Little is known of the honey badger's breeding habits. Its gestation period is thought to last six months, usually resulting in two cubs, which are born blind. Its lifespan in the wild is unknown, though captive individuals have been known to live for approximately 24 years.[10] The voice of the honey badger is a hoarse "khrya-ya-ya-ya" sound. When mating, males emit loud grunting sounds.[44] Cubs vocalise through plaintive whines.[10] When confronting dogs, honey badgers scream like bear cubs.[45]

Relationships with humans

Honey badgers often become serious poultry predators. Because of their strength and persistence, they are difficult to deter. They are known to rip thick planks from hen-houses or burrow underneath stone foundations. Surplus killing is common during these events, with one incident resulting in the death of 17 Muscovy ducks and 36 chickens.[30]

Because of the toughness and looseness of their skin, honey badgers are very difficult to hunt with dogs. Their skin is hard to penetrate, and its looseness allows them to twist and turn on their attackers when held. The only safe grip on a honey badger is on the back of the neck.[46]

During the British occupation of Basra in 2007, rumours of "man-eating badgers" emerged from the local population, including allegations that these beasts were released by the British troops, something that the British categorically denied.[47][48] A British army spokesperson said that the badgers were "native to the region but rare in Iraq" and "are usually only dangerous to humans if provoked".[49]

The honey badger has also been reported to dig up human corpses in India.[11] In Kenya, the honey badger is a major reservoir of rabies[50][51] and is suspected to be a significant contributor to the sylvatic cycle of the disease.[52]

References

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Further reading

Quelle: http://en.wikipedia.org/wiki/Mellivora_capensis