Black mamba

The first formal description of the black mamba was made in 1864 by German-born British zoologist Albert Günther. This specimen is the holotype and is housed in the Natural History Museum, London. The term "mamba" is derived from the Zulu word "imamba". In Tanzania, a local Ngindo name is ndemalunyayo ("grass-cutter") because it supposedly clips grass. In 1873, German naturalist Wilhelm Peters described Dendraspis Antinorii from a specimen in the museum of Genoa that had been collected by Italian explorer Orazio Antinori in what is now northern Eritrea. This was subsequently regarded as a subspecies a lumping diagnosis that remained in force until 1946 when South African herpetologist Vivian FitzSimons again split them into separate species. ==Description==

The black mamba is a long, slender, cylindrical snake. It has a coffin-shaped head with a somewhat pronounced brow ridge and a medium-sized eyes. and the second-longest venomous snake species overall, exceeded in length only by the king cobra. located at the front of the maxilla. The tail of the species is long and thin, the caudal vertebrae making up 17–25% of its body length. Specimens vary considerably in colour, including olive, yellowish-brown, khaki and gunmetal but are rarely black. The scales of some individuals may have a purplish sheen. Individuals occasionally display dark mottling towards the posterior, which may appear in the form of diagonal crossbands. Black mambas have greyish-white underbellies. The common name is derived from the appearance of the inside of the mouth, dark bluish-grey to nearly black. Mamba eyes range between greyish-brown and shades of black; the pupil is surrounded by a silvery-white or yellow colour. Juvenile snakes are lighter in colour than adults; these are typically grey or olive green and darken as they age. The black mamba has between 23 and 25 rows of dorsal scales at midbody, 248 to 281 ventral scales, 109 to 132 divided subcaudal scales, and a divided anal scale. Its mouth is lined with 7–8 supralabial scales above, with the fourth and sometimes also the third one located under the eye, and 10-14 sublabial scales below. Its eyes have 3 or occasionally 4 preocular and 2–5 postocular scales. ==Distribution and habitat==

, South Africa The black mamba inhabits a wide range in sub-Saharan Africa; its range includes Burkina Faso, Cameroon, Central African Republic, Democratic Republic of the Congo, South Sudan, Ethiopia, Eritrea, Somalia, Kenya, Uganda, Tanzania, Burundi, Rwanda, Mozambique, Eswatini, Malawi, Zambia, Zimbabwe, Botswana, South Africa, Namibia, and Angola. The black mamba's distribution in parts of West Africa has been disputed. In 1954, the black mamba was recorded in the Dakar region of Senegal. 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. The species prefers moderately dry environments such as light woodland and scrub, rocky outcrops and semi-arid savanna. It also inhabits moist savanna and lowland forests. It is not commonly found at altitudes above , although its distribution does include locations at in Kenya and in Zambia. It is rated as a species of least concern on the International Union for Conservation of Nature (IUCN)'s Red List of endangered species, based on its huge range across sub-Saharan Africa and no documented decline. ==Behaviour and ecology==

The black mamba is both terrestrial and arboreal. On the ground, it moves with its head and neck raised, and typically uses termite mounds, abandoned burrows, rock crevices and tree cracks as shelter. Black mambas are diurnal; in South Africa, they are recorded to bask between 7 and 10 am and again from 2 to 4 pm. They may return daily to the same basking site. During the threat display, any sudden movement by the intruder may provoke the snake into performing a series of rapid strikes, leading to severe envenomation. They generally prefer warm-blooded prey but will also consume other snakes. In the Transvaal area of South Africa, almost all recorded prey was rather small, largely consisting of rodents and similarly sized small or juvenile mammals as well as passerine birds, estimated to weigh only 1.9–7.8% of the mamba's body mass. The black mamba does not typically hold onto its prey after biting; rather it releases its quarry and waits for it to succumb to paralysis and death before it is swallowed. The snake's potent digestive system has been recorded to fully digest prey in eight to ten hours. Other eagles known to hunt or at least consume grown black mambas include tawny eagles and martial eagles. Young snakes have been recorded as prey of the Cape file snake. Mongooses, which have some resistance to mamba venom and are often quick enough to evade a bite, will sometimes harass or take a black mamba for prey, and may pursue them in trees. The similarly predatory honey badger also has some resistance to mamba venom. The mechanism in both mammals is thought to be that their muscular nicotinic acetylcholine receptors do not bind snake alpha-neurotoxins. Young mambas in the Serengeti are known to fall prey to southern ground hornbills, marsh owls and hooded vultures. ==Venom==

The black mamba is the most feared snake in Africa because of its size, aggression, venom toxicity and speed of onset of symptoms following envenomation, and is classified as a snake of medical importance by the World Health Organization. A survey in South Africa from 1957 to 1979 recorded 2,553 venomous snakebites, 75 of which were confirmed as being from black mambas. Of these 75 cases, 63 had symptoms of systemic envenomation and 21 died. Bites were often fatal before antivenom was widely available. A census in rural Zimbabwe in 1991 and 1992 revealed 274 cases of snakebite, of which 5 died. Black mambas were confirmed in 15 cases, of which 2 died. The peak period for deaths is the species' breeding season from September to February, during which black mambas are most irritable. Unlike many venomous snake species, black mamba venom does not contain protease enzymes. Its bites do not generally cause local swelling or necrosis, and the only initial symptom may be a tingling sensation in the area of the bite. The snake tends to bite repeatedly and let go, so there can be multiple puncture wounds. and 0.33 mg/kg. Other neurological symptoms include miosis (constricted pupils), blurred or diminished vision, paresthesia (a tingling sensation on the skin), dysarthria (slurred speech), dysphagia (difficulty swallowing), dyspnea (shortness of breath), difficulty handling saliva, an absent gag reflex, fasciculations (muscle twitches), ataxia (impaired voluntary movement), vertigo, drowsiness and loss of consciousness, and respiratory paralysis. Without appropriate antivenom treatment, symptoms typically progress to respiratory failure, which leads to cardiovascular collapse and death. In 2015, the proteome (complete protein profile) of black mamba venom was assessed and published, revealing 41 distinct proteins and one nucleoside. The venom is composed of two main families of toxic agents, dendrotoxins (I and K) and (at a slightly lower proportion) three-finger toxins. The composition of black mamba venom differs markedly from those of other mambas, all of which contain predominantly three-finger toxin agents. It is thought this may reflect the preferred prey items – small mammals for the mainly land-dwelling black mamba versus birds for the other predominantly arboreal mambas. Unlike many snake species, black mamba venom has little phospholipase A2 content. Treatment Standard first aid treatment for any suspected bite from a venomous snake is the application of a pressure bandage to the bite site, minimisation of movement of the victim and conveyance to a hospital or clinic as quickly as possible. The neurotoxic nature of black mamba venom means an arterial tourniquet may be of benefit. A polyvalent antivenom produced by the South African Institute for Medical Research is used to treat black mamba bites, and a new antivenom was being developed by the Universidad de Costa Rica's Instituto Clodomiro Picado. Notable bite cases • Danie Pienaar, who was at various times from at least 2009 head of South African National Parks Scientific Services and acting managing executive, survived the bite of a black mamba without antivenom in 1998. Despite the hospital physicians having declared it a "moderate" envenomation, Pienaar lapsed into a coma at one point and his prognosis was declared "poor". Upon arrival at the hospital, Pienaar was immediately intubated and placed on life support for 3 days. He was released from the hospital on the fifth day. Remaining calm after being bitten increased his chances of survival, as did the application of a tourniquet. • In March 2008, 28-year-old British trainee safari guide Nathan Layton was bitten by a black mamba that had been found near his classroom at the Southern African Wildlife College in Hoedspruit, Limpopo, South Africa. Layton was bitten by the snake on his index finger while it was being put into a jar and first aid-trained staff who examined him determined he could carry on with lectures. and collapsed and died shortly afterwards. • 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. Bleeding profusely, he did not seek medical attention, and except for intense pain and local swelling overnight, he was not affected. This led him to believe that either the snake gave him a "dry bite" (a bite without injecting venom) or the heavy bleeding pushed the venom out. Some commenters on the story suggested that it was a venomoid snake (in which the venom glands are surgically removed), but Laita responded that it was not. Only later did Laita find that he had captured the snake biting his leg in a photograph. • In 2016, Kenyan woman Cheposait Adomo was attacked by three black mambas, one of which bit her repeatedly on the leg, in West Pokot County, Kenya. People coming to her aid drove off the other snakes, hacking two with a machete. After an attempt at using traditional medicine, they placed her on a motorcycle and conveyed her 45 minutes to the nearest hospital, which had antivenom. She survived. • In 2017, a 31-year-old man named Arslan Valeev died in Saint Petersburg, Russia, after enticing a pet black mamba to bite him live on webcam in an apparent suicide. • Prominent South African anti-Apartheid activist and Labour Court judge Anton Steenkamp died after being bitten by a black mamba while on leave in Zambia in May 2019. He was several hours away from medical help and died before antivenom could be administered. • In June 2020, Bulgarian veterinarian Georgi Elenski from Haskovo was bitten by a black mamba that was part of his personal collection of exotic animals. His initial condition was very serious, but he recovered after extensive treatment involving the administering of antivenom and respiratory support. • In January 2022, a former newspaper office worker and farmer from Zimbabwe, Peter Dube, died after getting bitten by a black mamba, due to the hospital he was taken to not having any antivenom to treat him. • In January 2023, a 17-year-old student from Zimbabwe died after being bitten by a black mamba. The snake had gone into a high school classroom while the students were outside. ==Notes==