Black mamba

For other uses, see Black mamba (disambiguation).

Black mamba
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Elapidae
Subfamily: Elapinae
Genus: Dendroaspis
Species: D. polylepis
Binomial name
Dendroaspis polylepis
Günther, 1864[2]

In red, range of D. polylepis
In brown, D. polylepis may or may not occur here

Synonyms[3]
  • Dendroaspis polylepis polylepis
    (Günther, 1864)
  • Dendraspis polylepis
    (Günther, 1864)
  • Dendraspis angusticeps
    (Boulenger 1896)
  • Dendraspis antinorii
    (Peters, 1873)
  • Dendroaspis polylepis antinorii
    (Peters, 1873)

The black mamba (Dendroaspis polylepis) is a venomous snake endemic to parts of sub-Saharan Africa. Specimens vary in color from grey to dark brown, but not black. Juvenile black mambas tend to be lighter in color than adults and darken with age. It is the longest species of venomous snake indigenous to the African continent; mature specimens generally exceed 2 meters (6.6 ft) and commonly attain 3 meters (9.8 ft). Specimens of 4.3 to 4.5 meters (14.1 to 14.8 ft) have been reported.

Although most mamba species are tree-dwelling snakes, the black mamba is not generally arboreal, preferring lairs in terrestrial habitats in a range of terrains. These include savannah, woodlands, rocky slopes and in some regions dense forest. It is diurnal and chiefly an ambush predator, known to prey on hyrax, bushbabies and other small mammals as well as birds. It is also a pursuit predator; in this it resembles some other long, speedy, highly-venomous species with well-developed vision. Over suitable surfaces it is possibly the speediest species of snake, capable of at least 11 km/h (6.8 mph) over short distances. Adult mambas have few natural predators.

In a threat display, the mamba usually opens its inky black mouth, spreads its narrow neck-flap and sometimes hisses. It is capable of striking at considerable range and occasionally may deliver a series of bites in rapid succession. Its venom is primarily composed of potent neurotoxins which may cause fast onset of symptoms. Despite its reputation for being formidable and highly aggressive, like most snakes, it usually attempts to flee from humans unless threatened or cornered. Not being proximal to humans, bites from the black mamba are not frequent.

Taxonomy

The black mamba is the species Dendroaspis polylepis in the genus Dendroaspis of the family Elapidae. The first formal description was by Albert Günther in 1864.[2][3] Although it had been known previously to missionaries[4] and residents[5] by the name "mamba". Which was already established in the vernacular, presumably borrowed from the Zulu language. In 1873, Wilhelm Peters described two subspecies: the nominotypical D.polylepis polylepis and also D.polylepis antinorii.[3] However, these are no longer held to be distinct.[2] In 1896, Boulenger combined the species (Dendroaspis polylepis) as a whole with the eastern green mamba (Dendroaspis angusticeps),[6] a lumping diagnosis that remained in force until 1946, when FitzSimons split them into separate species again.[7][8]

The generic name, Dendroaspis, derives from Ancient Greek dendro (δένδρο), meaning "tree",[9] and aspis (ασπίς), which is understood to mean "shield",[10] but also denotes "cobra" or simply "snake", in particular "snake with hood (shield)". Via Latin aspis, it is the source of the English word "asp". In ancient texts, aspis or asp often referred to the Egyptian cobra (Naja haje), in reference to its shield-like hood.[11] Thus, "Dendroaspis" literally means tree asp, reflecting the arboreal nature of most of the species within the genus.

The specific epithet polylepis is derived from the Ancient Greek poly (πολύ) meaning "many" and lepis (λεπίς) meaning "scale".[12] It apparently refers to the scale count of this species, which is higher than some other species in the genus.

Description

The black interior of the mouth of a black mamba

Dendroaspis polylepis is a large, round-bodied, slender, but powerful snake. It tapers smoothly towards the tail, but is of markedly more robust build than its distinctly gracile congeners Dendroaspis angusticeps and Dendroaspis viridis.[13] The head is often said to be "coffin-shaped" with a somewhat pronounced brow ridge and a medium-sized eye.[14] It is a highly proteroglyphous snake, with fangs up to 6.5 millimeters (0.26 in) in length[15] located at the front of the maxilla.[13] The adult snake's length ranges from 2 meters (6.6 ft) to 3 meters (9.8 ft) routinely[13] but, according to some sources, specimens have grown to lengths of 4.3 to 4.5 meters (14.1 to 14.8 ft).[7][13] Black mambas weigh about 1.6 kilograms (3.5 lb)[16][17] on average. A specimen of 1.41 meters (4.6 ft) was found to have weighed 651.7 g (1.437 lb).[18] Dendroaspis polylepis is the second longest venomous snake species, exceeded in length only by the king cobra.[13]

In spite of its common name, the black mamba is not actually black;[7][13] in fact the interior of the snake's mouth is its only conspicuously black feature.[7] Specimens vary considerably in color; some are olive-brown to khaki, many are grey, and some individuals display dark mottling towards the posterior. Such mottling may appear in the form of oblique bars.[13] The underbody is often pale yellow or cream colored and the eyes are dark brown to black with a silver or pale yellow corona surrounding the pupil.[19] Juvenile snakes are lighter in color than adults, typically grey or olive green in appearance, and they darken with age.

The "black" mamba has been said to take its name from the color of the inside of its mouth, but this claim is an urban legend, a factoid that lacks objective or historical support. In particular, it was referred to as the "black mamba" decades before knowledge of the color of its oral mucosa was in common circulation.[20][21] Common names for mambas are to be taken no more seriously than any other common names, and we find for example that attempts to impose the more logical common name "common mamba" for the "black mamba",[22] which after all is not black, have been abandoned in favor of applying "common mamba" to the Eastern green mamba, Dendroaspis angusticeps. In the mean time, since the late twentieth century, some authors have unquestioningly copied the claim that the name derived from the color of its open mouth.[16]

Scalation

Like most Elapidae, the scales of the black mamba are smooth and flat, without keels. Most specimens feature 23–25 rows of scales, but rarely as few as 21.[23]

The head, body and tail scalation of the black mamba:[23]

  • Dorsal at midbody: 23–25 (rarely 21)
  • Ventral: 248–281
  • Subcaudal: 109–132 (paired)
  • Anal plate: Divided
  • Upper labials: 7-8
  • Upper labials to eye: 4th (3rd and 4th)
  • Preoculars: 3 (occasionally 4)
  • Postoculars: 3-4 (occasionally 2–5)
  • Lower labials: 11-13 (occasionally 10–14)
  • Temporal: 2+3 (variable)

Distribution and habitat

The black mamba has a wide and fragmented range within sub-Saharan Africa. Specifically, it has been observed in: north east Democratic Republic of the Congo, south western Sudan to Ethiopia, Eritrea, Somalia, Kenya, eastern Uganda, Tanzania, Burundi, Rwanda, southwards to Mozambique, Swaziland, Malawi, Zambia, Zimbabwe and Botswana to KwaZulu-Natal in South Africa, and Namibia; then north easterly through Angola to south eastern Democratic Republic of the Congo.[15][24] The black mamba's distribution contains gaps within the Central African Republic, Chad, Nigeria and Mali. These gaps may lead physicians to misidentify black mamba bites and administer an inappropriate antivenom.[24]

The black mamba was also recorded in 1954 in West Africa, in the Dakar region of Senegal.[24] However, this observation, and a subsequent observation that identified a second specimen in the region in 1956, has not been confirmed and thus the snake's distribution in this area is inconclusive.[24] The black mamba is not commonly found at altitudes above 1,000 metres (3,300 ft), although its distribution does reach 1,800 metres (5,900 ft) in Kenya and 1,650 metres (5,410 ft) in Zambia.[24]

The black mamba is primarily terrestrial, but occasionally arboreal, especially where it occurs in forest.[25] Typically it inhabits neglected areas of scrub, termite mounds, abandoned burrows and rock crevices.[23] It is adapted to terrain ranging from savannah and woodland to rocky slopes and dense forests.[24] The black mamba prefers moderately dry environments such as light woodland and scrub, rocky outcrops, and semi-arid dry savannah, to dense forest or arid desert.[24]

Behaviour and ecology

A black mamba in defensive posture

The black mamba is graceful but skittish and often unpredictable. It is agile and can move quickly.[15][23] It is shy and secretive by nature and, like most snakes, avoids threats.[23] In the wild, a black mamba seldom tolerates humans approaching more closely than about 40 meters.[23] When confronted it can display great truculence and is likely to gape in a threat display, exposing its black mouth and flicking its tongue. It also is likely to form a hood by spreading its neck-flap as cobras do. The mamba's hood however, is narrower than that of a typical cobra.[15][23] The threat display may be accompanied by audible hissing.[16]

During the threat display, any sudden movement by the intruder may provoke the mamba into a series of rapid strikes leading to severe envenomation.[23] Also, the size of the black mamba, plus its ability to raise its head well off the ground, enable it to launch as much as 40% of its body length upwards, so mamba bites in humans quite often are on the upper body near the brain thus having quick effects.[15][26] This behaviour also permits the snake to land a strike at unexpectedly long range.[23] The black mamba's reputed readiness to attack is often much exaggerated and usually is provoked by perceived threats, such as blocking its intended retreat, accidentally or otherwise.[15]

Speed

For its slender body, the black mamba is deceptively powerful; it is the fastest moving snake indigenous to Africa, and perhaps the fastest anywhere.[27][28][29] It does however, move rather clumsily over soft sand, a surface to which it is not adapted.[30] There have been many unrealistic stories concerning the black mamba's speed,[31] perhaps partly because the slender body exaggerates the impression of speed.[32] These stories include the myth that it can outrun a galloping horse or a running human. On 23 April 1906, on the Serengeti Plains, an intentionally provoked black mamba was recorded at a speed of 11 km/h (6.8 mph), over a distance of 43 m (141 ft).[33][34][35] A black mamba would almost certainly not be able to exceed 16 km/h (9.9 mph),[31][32] and like most reptiles it can maintain such relatively high speeds only for short distances.[32]

Diet

The black mamba is diurnal and chiefly an ambush predator, though it has been recorded as hunting partly by pursuit, such as catching pigeons at a watering hole before they can gain sufficient height to escape. It usually goes hunting from a permanent lair, to which it will regularly return, providing that the hunting is good and it is not disturbed.[15] It hunts mainly by sight and in doing so it commonly will raise much of its length well off the ground.[15] The black mamba does not typically hold onto prey after biting, instead releasing its quarry and waiting for it to succumb to paralysis and die.[19] This however depends on the type of prey; for example, it typically will hold onto a bird till it stops struggling to escape. If prey attempts to escape or defend itself, the black mamba often may follow up its initial bite with a rapid series of strikes to incapacitate and quickly kill its prey.[23] The snake has been known to prey on hyrax and rock hyrax, bushbabies, and bats.[7] The black mamba has a potent digestive system and has been observed to digest prey fully within eight to ten hours.[15]

Predators

The yellow mongoose will prey on black mambas

Not many predators challenge an adult black mamba although it does face a few threats such as birds of prey, particularly snake eagles.[36] Although all species of snake eagle commonly prey on snakes, there are two species in particular that do so with high frequency, including preying on black mambas. These are the black-chested snake eagle (Circaetus pectoralis) and the brown snake eagle (Circaetus cinereus). The Cape file snake (Mehelya capensis), which is apparently immune to all African snake venoms and preys on other snakes including venomous ones, is a common predator of black mambas (limited only by the size it can swallow).[7][37][38] Mongooses which also are partially immune to venom, and are often quick enough to evade a bite, will sometimes tackle a black mamba for prey.[39] Humans do not usually consume black mambas, but they often kill them out of fear.[40]

Reproduction

Male black mambas engaged in combat

Black mambas breed annually and mating occurs in the early spring, when male mambas locate a female by following her scent trail. After finding a potential mate the male will inspect the female by flicking his tongue over her entire body.[15] As in other species of snakes and many other reptiles, fertilization is internal and the intromittent organs of the males are in the form of hemipenes. Females lay clutches of eggs with an incubation period of some 80 to 90 days. Like most snakes female mambas are both oviparous and iteroparous.[15] Egg-laying typically occurs during the middle of summer and egg clutches range from 6 to 17 eggs.[15]

During the mating season rival males may compete by wrestling, not by biting. Opponents attempt to subdue each other by intertwining their bodies and raising their heads high off the ground. Observers have on occasion mistaken such wrestling for mating.[41]

Black mambas are generally solitary, but not strictly so; as a rule they interact very little except in male rivalry during the mating season. However, black mambas are well known to share retreats occasionally, either with other mambas, or sometimes with other species of snakes.

In hatching, mambas break though the egg shell with an egg tooth and are born with fully developed venom glands; capable of inflicting a potentially lethal bite minutes after hatching. The body of the newly hatched snake contains the residues of the egg yolk, and assimilates them to sustain the young snake until it finds its first prey.[15]

Lifespan

There is little information available concerning the lifespan of wild black mambas, but the longest surviving captive example had a recorded lifespan of 11 years.[15][16] It is possible that wild snakes may live significantly longer than this.[15]

Venom

The venom of the black mamba is extremely toxic, commonly causing collapse in humans within 45 minutes or less from a single bite. Without effective antivenom therapy, death typically occurs in 7–15 hours. The venom is chiefly composed of neurotoxins, specifically dendrotoxin. The black mamba is capable of striking at considerable range and occasionally may deliver a series of bites in rapid succession. Despite its reputation for being highly aggressive, like most snakes, it usually attempts to flee from humans unless threatened or cornered.

The black mamba feeding

The black mamba's venom is composed of neurotoxins (dendrotoxin) and cardiotoxins as well as other toxins such as fasciculins.[15][36][42] In an experiment, the most abundant toxin found in black mamba venom was observed to be able to kill a mouse in as little as 4.5 minutes.[43] Based on the murine median lethal dose (LD50) values, the black mamba's toxicity from all published sources is as follows:

Its bites can deliver about 100–120 mg of venom on average and the maximum dose recorded is 400 mg.[36] It is reported that before antivenom was widely available, the mortality rate from a bite was nearly 100%.[16] The bite of a black mamba can potentially cause collapse in humans within 45 minutes, or less.[51] Without effective antivenom therapy, death typically occurs in 7–15 hours.[36] Presently, there is a polyvalent antivenom produced by the South African Institute for Medical Research to treat black mamba bites from many localities.[52]

A bite from a black mamba causes initial neurological and neuromuscular symptoms which may commonly include headache and a metallic taste in the mouth, which may be accompanied by a triad of paresthesias, profuse perspiration and salivation.[53] Other symptoms may include ptosis and gradual bulbar palsy.[53] Localised pain or numbness around the bite site is common but not typically severe;[54] therefore, application of a tourniquet proximal to the bite site is feasible and may assist in slowing the onset of prominent neurotoxicity.[53] Without appropriate treatment, symptoms typically progress to more severe reactions such as tachydysrhythmias and neurogenic shock, leading to death by asphyxiation, cardiovascular collapse, or respiratory failure.[36][42][53]

Attacks on humans

The black mamba is popularly regarded as the most dangerous and feared snake in Africa;[43] to South African locals the black mamba's bite is known as the "kiss of death".[55] However, attacks on humans by black mambas are rare, as they usually try to avoid confrontation, and their occurrence in highly populated areas is not very common compared with some other species.[56] Additionally, the ocellated carpet viper is responsible for more human fatalities due to snakebite than all other African species combined.[47] A survey of snakebites in South Africa from 1957 to 1963 recorded over 900 venomous snakebites, but only seven of these were confirmed black mamba bites, at a time when effective antivenom was not widely available. Out of more than 900 bites, only 21 ended in fatalities, including all seven black mamba bites.[57]

Reported bite cases

Danie Pienaar, now head of South African National Parks Scientific Services,[58] survived the bite of a black mamba without antivenom in 1998. Although no antivenom was administered, Pienaar was in serious condition, despite the fact the hospital physicians declared it a "moderate" black mamba envenomation. At one point, Pienaar lapsed into a coma and his prognosis was declared "poor". Upon arrival at hospital Pienaar was immediately intubated, given supportive drug therapy, put on mechanical ventilation and was placed on life support for three days, until the toxins were flushed out of his system. He was released from hospital on the fifth day. Pienaar believes he survived for a number of reasons. In an article in Kruger Park Times he said: "Firstly, it was not my time to go." The article went on to state, "The fact that he stayed calm and moved slowly definitely helped. The tourniquet was also essential."[59]

In another case, 28-year-old British student Nathan Layton was bitten by a black mamba and died of a heart attack in less than an hour in March 2008. The black mamba had been found near a classroom at the Southern African Wildlife College in Hoedspruit, where Layton was training to be a safari guide. Layton was bitten by the snake on his index finger while it was being put into a jar, but he didn't realize he'd been bitten. He thought the snake had only brushed his hand. Approximately 30 minutes after being bitten Layton complained of blurred vision. He collapsed and died of a heart attack, nearly an hour after being bitten. Attempts to revive him failed, and he was pronounced dead at the scene.[60][61]

In a rare case of survival without treatment, American professional photographer Mark Laita was bitten on the leg by a black mamba during a photo-shoot of a black mamba at a facility in Central America. The bite ruptured an artery in his calf, and he was gushing blood profusely. Laita did not go to the doctor or the hospital, and except for the swollen fang marks giving him intense pain during the night, he was not affected and was fine physically. This led him to believe that the snake either gave him a "dry bite" (meaning without injecting venom) or that the heavy bleeding pushed the venom out. Some commenters to the story suggested that it was a venomoid snake (in which the venom glands are surgically removed). Laita responded that it was not the case. Only later, Laita found that he had captured the snake biting his leg in a photograph.[62][63][64]

References

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  5. ↑ Journal of the Society of Arts. The Society. 1859. pp. 252–.
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  15. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 FitzSimons, Vivian F.M. (1970). A Field Guide to the Snakes of Southern Africa (Second ed.). HarperCollins. pp. 167–169. ISBN 0-00-212146-8.
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  22. ↑ Vesey-Fitzgerald,Desmond Foster. A Guide to the Snakes of the Tanzania and Kenya Borderlands 1975
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  31. 1 2 Mikael Jolkkonen, Muscarinic Toxins from Dendroaspis (Mamba) Venom Page 15, Uppsala University
  32. 1 2 3 Warren, Schmidt (2006) Reptiles & Amphibians of Southern Africa, Page 34
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  35. ↑ Harry W. Greene, (1997), Snakes: The Evolution of Mystery in Nature, Page 40
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  38. ↑ Mehelya capensis (Southern file snake, Cape file snake) Archived May 4, 2014, at the Wayback Machine., Iziko South African Museum
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  47. 1 2 JERRY G. WALLS, "The World's Deadliest Snakes", Reptiles
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  50. ↑ Zug, GR. (1996). Snakes in Question: The Smithsonian Answer Book. Washington D.C., US: Smithsonian Institution Scholarly Press. ISBN 1-56098-648-4.
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  52. ↑ Davidson, Terence. "IMMEDIATE FIRST AID". University of California, San Diego. Retrieved 2010-05-12.
  53. 1 2 3 4 S.B. Dreyer; J.S. Dreyer (November 2013). "Snake Bite: A review of Current Literature". East and Central African Journal of Surgery. 18 (3): 45–52. ISSN 2073-9990. Retrieved 2 March 2015.
  54. ↑ Závada J.; Valenta J.; Kopecký O; Stach Z.; Leden P. "Black Mamba Dendroaspis Polylepis Bite: A Case Report". Department of Anesthesiology and Intensive Care, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague, Czech Republic. Retrieved 25 February 2015.
  55. ↑ "Black Mamba: Kiss of Death". Smithsonian Channel. Retrieved 15 February 2015.
  56. ↑ The new encyclopedia of Reptiles (Serpent). Time Book Ltd. 2002.
  57. ↑ O'Shea, M. (2005). Venomous Snakes of the World. United Kingdom: New Holland Publishers. p. 78. ISBN 0-691-12436-1. ... in common with other snakes they prefer to avoid contact; ... from 1957 to 1963 ... including all seven black mamba bites - a 100 per cent fatality rate
  58. ↑ "Scientists gather in Kruger National Park for Savanna Science Network Meeting". South African Tourism. 5 March 2013. Retrieved 26 April 2014.
  59. ↑ "Surviving a Black Mamba bite". Siyabona Africa - Kruger National Park. Siyabona Africa. Retrieved 26 April 2014.
  60. ↑ "British trainee safari guide killed by bite from a black mamba snake he thought had just brushed his hand". UK Daily Mail. Retrieved 20 December 2013.
  61. ↑ "Black mamba snake bite killed British student Nathan Layton". Mirror News. Retrieved 20 December 2013.
  62. ↑ Rowan Hooper (January 19, 2012) Portraits of snake charm worth elephant-killing bite newscientist
  63. ↑ Megan Gambino. "Snakes in a Frame: Mark Laita's Stunning Photographs of Slithering Beasts". Smithsonian. Retrieved 1 February 2015.
  64. ↑ "Black Mamba Bite: The Back Story". strange behaviors. Retrieved 1 February 2015.

Further reading

  • Thorpe, Roger S.; Wolfgang Wüster, Anita Malhotra (1996). Venomous Snakes: Ecology, Evolution, and Snakebite. Oxford, England: Oxford University Press. ISBN 978-0-19-854986-4
  • McDiarmid, Roy W.; Jonathan A. Campbell; T'Shaka A. Tourè (1999). Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Washington, District of Columbia: Herpetologists' League. ISBN 978-1-893777-01-9
  • Spawls, Stephen; Branch, Bill (1995). Dangerous Snakes of Africa: Natural History - Species Directory - Venoms and Snakebite. Ralph Curtis Pub; Revised edition. ISBN 978-0-88359-029-4
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External links

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