The Gaboon viper (Bitis gabonica), also called the Gaboon adder, is a large and highly venomousviperspecies found in the rainforests and savannas of sub-Saharan Africa.[1][3][2] Like all other vipers, it is venomous. It is the largest member of the genus Bitis,[4][5] and has the longest fangs of any venomous snake – up to 2 inches (5.1cm) in length – and the highest venom yield of any snake.[5][6] No subspecies are recognized.[3][7]
The Gaboon viper was described in 1854 as Echidna gabonica.[8]
Lenk et al. (1999) discovered genetic differences between the two conventionally recognized subspecies of B. g. gabonica and B. g. rhinoceros. According to their research, these two subspecies are as genetically different from each other as they are from B. nasicornis. Consequently, they regard the western form as a separate species, B. rhinoceros.[9]
The snake's common names include Gaboon viper, butterfly adder, forest puff adder, whisper,[5] swampjack,[5] and Gaboon adder.[4][10]
Originally a name given by the Portuguese, Gabon (Gabão) refers to the estuary on which the town of Libreville was built, in Gabon, and to a narrow strip of territory on either bank of this arm of the sea. As of 1909, Gaboon referred to the northern portion of French Congo, south of the equator and lying between the Atlantic Ocean and 12°E longitude.[11]
Description
Adults are typically 125–155cm (4.10–5.09ft) in total length (body and tail). The maximum total length of this species is often cited as 205cm (81in) for a specimen collected in Sierra Leone, but individuals from this locale are now reclassified as Bitis rhinoceros. The sexes may be distinguished by the length of the tail in relation to the total length of the body: around 12% for males and 6% for females. Adults, especially females, are very heavy and stout. One female measured at 174cm (69in) in total length, a head width of 12cm (4.7in), a width or circumference of 37cm (15in), and a weight of 8.5kg (19lb).[5]
Complete skeleton and skull of B. gabonica
In their description of B. gabonica, Spawls et al. (2004) give a total length of 80–130cm (31.5–51in), with a maximum total length of 175cm (69in), saying the species may possibly grow larger still. They acknowledge reports of specimens over 1.8m (5.9ft), or even over 2m (6.6ft) in total length, but claim no evidence supports this.[12] A large specimen of 1.8m (5.9ft) total length, caught in 1973, was found to have weighed 11.3kg (25lb) with an empty stomach.[13] It is the heaviest venomous snake in Africa and one of the heaviest in the world along with the king cobra and eastern diamondback rattlesnake.[14]
The head is large and triangular, while the neck is greatly narrowed, only about one-third the width of the head.[5] A pair of "horns" is present between the raised nostrils—tiny in B. gabonica.[12] The eyes are large and moveable,[5] set well forward,[12] and surrounded by 15–21 circumorbital scales.[5] The species has 12–16 interocular scales across the top of the head. Four or five scale rows separate the suboculars and the supralabials, with 13–18 supralabials and 16–22 sublabials.[5] The fangs may reach a length of 55mm (2.2in),[4] the longest of any venomous snake.[5]
Midbody, the 28–46 dorsal scale rows are strongly keeled except for the outer rows on each side. The lateral scales are slightly oblique. The ventral scales number 124–140, rarely more than 132 in males, rarely less than 132 in females. With 17–33 paired subcaudal scales, males have no fewer than 25, and females no more than 23. The anal scale is single.[5]
The color pattern is striking in the open, but in nature, typically among dead leaves under trees, it provides a high degree of camouflage; in a well-kept cage with a suitable base of dried leaves, overlooking several fully exposed specimens completely is easy.[citation needed] The pattern consists of a series of pale, subrectangular blotches running down the center of the back, interspaced with dark, yellow-edged, hourglass markings. The flanks have a series of fawn or brown rhomboidal shapes, with light vertical central bars. The belly is pale with irregular brown or black blotches. The head is white or cream with a fine, dark central line, black spots on the rear corners, and a dark blue-black triangle behind and below each eye.[12] The iris colour is cream, yellow-white, orange,[12] or silvery.[15] A possible Batesian mimic of the Gaboon viper has been found, which is the Congolese giant toad (Sclerophrys channingi); this species of frog seems to resemble the viper's head, which contrasts with its darker-colored body.[16]
The Gaboon viper is usually found in rainforests and nearby woodlands, mainly at low altitudes,[15] but sometimes as high as 1500m above sea level.[5] Spawls et al. (2004) mention a maximum altitude of 2100 m.[12] According to Broadley and Cock (1975), it is generally found in environments that are parallel to those occupied by its close relative, B. arietans, which is normally found in more open country.[17]
In Tanzania, this species is found in secondary thickets, cashew plantations, and agricultural land under bushes and in thickets. In Uganda, they are found in forests and nearby grasslands. They also do well in reclaimed forest areas - cacao plantations in West Africa and coffee plantations in East Africa. They have been found in evergreen forests in Zambia. In Zimbabwe, they only occur in areas of high rainfall along the forested escarpment in the east of the country. In general, they may also be found in swamps, as well as in still and moving waters. They are commonly found in agricultural areas near forests and on roads at night.[5]
Behavior
A Gaboon viper can blend in with its surroundings.
Primarily nocturnal, Gaboon vipers have a reputation for being slow-moving and placid. They usually hunt by ambush, often spending long periods motionless, waiting for suitable prey to pass by, though they have been known to hunt actively, mostly during the first six hours of the night. In Kumasi, Ghana, they were regularly killed by ranch hands around some stables in an open field with the forest some 500 meters away—a sign that they were hunting rats in the grassland. They are usually very tolerant snakes, even when handled, and rarely bite or hiss, unlike most vipers. However, bites by bad-tempered individuals do occur.[12]
Locomotion is mostly rectilinear, in a sluggish "walking" motion of the ventral scales. They may writhe from side to side when alarmed, but only for short distances.[5]Ditmars (1933) even described them as being capable of sidewinding.[18]
If threatened, Gaboon vipers may hiss loudly as a warning, doing so in a deep and steady rhythm, slightly flattening the head at the expiration of each breath.[5][12][18] Despite this, they are unlikely to strike unless severely provoked;[5] however, they are one of the fastest-striking snakes in the world, so care should be taken in handling them. It is best to avoid handling them in most circumstances.
Numerous descriptions have been given of their generally unaggressive nature. Sweeney (1961) wrote they are so docile that they "can be handled as freely as any nonvenomous species," although this is absolutely not recommended. In Lane (1963), Ionides explained he would capture specimens by first touching them lightly on the top of the head with a pair of tongs to test their reactions. Hissing and anger were rarely displayed, so the tongs were usually set aside and the snakes firmly grasped by the neck with one hand and the body supported with the other as he picked them up and carried them to a box for containment. He said the snakes hardly ever struggled.[5]
Parry (1975) described how this species has a wider range of eye movement than other snakes. Along a horizontal plane, eye movement can be maintained even if the head is rotated up or down to an angle of up to 45°. If the head is rotated 360°, one eye will tilt up and the other down, depending on the direction of rotation. Also, if one eye looks forward, the other looks back, as if both are connected to a fixed position on an axis between them. In general, the eyes often flick back and forth in a rapid and jerky manner. When asleep, no eye movement occurs and the pupils are strongly contracted. The pupils dilate suddenly and eye movement resumes when the animal awakens.[5]
Feeding
Because of their large, heavy body size, the adults have no trouble eating prey as large as fully grown rabbits. When prey happens by, they strike from any angle. They can quickly reposition their fangs if they happen to miss or strike an unsuitable area of their prey.[19] Once they strike their prey, they hang on to it with their large fangs rather than letting it go and waiting for it to die. This behaviour is very different from that of other species of vipers. These snakes feed on a variety of amphibians, mammals, and birds such as doves, guineafowl, and francolins.[20] They also hunt many different species of rodent, including field mice and rats, as well as hares and rabbits.[20] More unlikely prey items, such as tree monkeys, the Gambian pouched rat, the brush-tailed porcupine, and even the small royal antelope have been reported.[5][20]
Reproduction
During peak sexual activity, males engage in combat. This starts with one male rubbing his chin along the back of the other. The second male then raises his head as high as possible. As they both do the same, their necks intertwine. When the heads are level, they turn towards each other and push. Their bodies intertwine as they switch positions. They become oblivious to everything else, continuing even after they fall off a surface or into water. Sometimes, they intertwine and squeeze so tightly that their scales stand out from the pressure. They have also been observed to strike at each other with mouths closed. Occasionally, the combatants tire and break off the fight by "mutual consent", resting for a while before resuming once more. The event is settled when one of the two succeeds in pushing the other's head to the ground and raising his own by 20–30cm. In captivity, combat may occur four or five times a week until courtship and copulation end.[5] Females can have 50 to 60 babies at a time. The young are born live.[21]
Venom
Bites from this species are extremely rare because they are seldom aggressive and their range is mostly confined to rainforest areas.[4] Since they are sluggish and unwilling to move even when approached, the humans they bite are usually those accidentally stepping on them. However, not all of the cases of persons stepping on this species of snake results in the person getting bitten.[22] When a bite does occur, it should always be considered a serious medical emergency. Even an average bite from an average-sized specimen is potentially fatal.[4]Antivenom should be administered as soon as possible to save the affected limb or indeed the victim's life.[17]
The snake's venom is cytotoxic and cardiotoxic.[23] In mice, the LD50 is 0.8–5.0mg/kg intravenously, 2.0mg/kg intraperitoneally, and 5.0–6.0mg/kg subcutaneously.[24] Since their venom glands are enormous, each bite produces the second-largest quantity of venom of any venomous snake; this is partially because, unlike many African vipers, such as the puff adder, the Gaboon viper does not release after a bite, which enables it to inject larger amounts of venom[citation needed]. Yield is probably related to body weight, as opposed to milking interval.[5] Brown (1973) gives a venom yield range of 200–1000mg (of dried venom).[24] A range of 200–600mg for specimens 125–155cm in length has also been reported.[5] Spawls and Branch (1995) state from 5 to 7 mL (450–600mg) of venom may be injected in a single bite.[4]
A study by Marsh and Whaler (1984) reported a maximum yield of 9.7 mL of wet venom, which translated to 2400mg of dried venom. They attached "alligator" clip electrodes to the angle of the open jaw of anesthetized specimens (length 133–136cm, girth 23–25cm, weight 1.3–3.4kg), yielding 1.3–7.6 mL (mean 4.4 mL) of venom. Two to three electrical bursts within a space of five seconds apart were enough to empty the venom glands. The Gaboon vipers used for the study were milked between seven and 11 times over a 12-month period, during which they remained in good health and the potency of their venom remained the same.[5]
From how sensitive monkeys were to the venom, Whaler (1971) estimated 14mg of venom would be enough to kill a human being, equivalent to 0.06 mL of venom, or 1/50 to 1/1000 of what can be obtained in a single milking. Marsh and Whaler (1984) wrote that 35mg (1/30 of the average venom yield) would be enough to kill a man of 70 kilograms (150lb).[5] Branch (1992) suggested that 90–100mg would be fatal in humans.
In humans, a bite from a Gaboon viper causes rapid and conspicuous swelling, intense pain, severe shock, and local blistering. Other symptoms may include uncoordinated movements, defecation, urination, swelling of the tongue and eyelids, convulsions, and unconsciousness.[5] Blistering, bruising, and necrosis may be extensive. Sudden hypotension, heart damage, and dyspnoea may occur.[12] The blood may become incoagulable, with internal bleeding that may lead to haematuria and haematemesis.[4][12] Local tissue damage may require surgical excision and possibly amputation to any affected limb.[4] Healing may be slow and fatalities during the recovery period are not uncommon.[12]
Related Research Articles
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Bitis is a genus of vipers found in Africa and the southern Arabian Peninsula. It includes the largest and the smallest vipers in the world. Members are known for their characteristic threat displays that involve inflating and deflating their bodies while hissing and puffing loudly. The type species for this genus is B. arietans, which is also the most widely distributed viper in Africa. Currently, 18 species are recognized.
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The puff adder is a highly venomous viper species found in savannahs and grasslands from Morocco and western Arabia throughout Africa except for the Sahara and rainforest regions. It is responsible for causing the most snakebite fatalities in Africa owing to various factors, such as its wide distribution, frequent occurrence in highly populated regions, and aggressive disposition. Like all other vipers, it is venomous. Two subspecies are currently recognized, including the nominate subspecies described here.
Atheris squamigera is a venomous viper species endemic to west and central Africa. No subspecies are currently recognized.
Causus is a genus of vipers found only in sub-Saharan Africa. It is a group considered to be among the most primitive members of the family Viperidae based on head scalation, oviparity, venom apparatus, and because they have round pupils. However, this is contradicted by recent molecular studies. Seven species are currently recognized. They are commonly known as night adders. Like all other vipers, they are venomous.
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Vipera ammodytes, commonly known as horned viper, long-nosed viper, nose-horned viper, and sand viper, is a species of viper found in southern Europe, mainly northern Italy, the Balkans, and parts of Asia Minor. Like all other vipers, it is venomous. It is reputed to be the most dangerous of the European vipers due to its large size, long fangs and high venom toxicity. The specific name, ammodytes, is derived from the Greek words ammos, meaning "sand", and dutes, meaning "burrower" or "diver", despite its preference for rocky habitats. Five subspecies are currently recognized, including the nominate subspecies described here.
The berg adder is a viper species endemic to mountainous regions in southern Africa. No subspecies are currently recognized.
The horned adder is a viper species. It is found in the arid region of southwest Africa, in Angola, Botswana, Namibia; South Africa, and Zimbabwe. It is easily distinguished by the presence of a single, large horn-like scale over each eye. No subspecies are currently recognized. Like all other vipers, it is venomous.
The many-horned adder is a viper species. It is found in certain rocky desert areas, mostly along the Atlantic coast of southern Africa, in western South Africa and southwestern Namibia. It has characteristic tufts of "horns" above each eye. Like all other vipers, it is venomous. No subspecies are currently recognized.
Bitis inornata is a venomous viper species found only in Cape Province, South Africa. No subspecies are currently recognized.
Bitis parviocula is a venomous viper species found only in Ethiopia. It is large with a broad head and spectacular geometric markings. In 1995, the species was known from only three specimens, but additional information has surfaced since then. Little is known about its natural history or its venom. No subspecies are currently recognized.
Bitis peringueyi, also known as the Peringuey's adder, Peringuey's desert adder or desert sidewinding adder, is a viper species found in Namibia and southern Angola. No subspecies are currently recognized.
Bitis rhinoceros is a viper species endemic to West Africa. Like all vipers, it is venomous. It can be easily distinguished from the closely related species B. gabonica by the presence of two large nasal "horns".
Causus maculatus is viper species found mainly in West- and Central Africa. No subspecies are currently recognized. Common names include forest rhombic night adder, West African night adder and spotted night adder. Like all other vipers, it is venomous.
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