Introduction
The taipan belongs to a genus of large, fast and highly venomous Australasian snakes of the
elapid family. Other members of the family include cobras, kraits, mambas, death adders and sea snakes. All the really fun brands.
The name ‘Taipan’ is the name given to one member of the genus by the Wik-mungkan people of Cape York. It was introduced into general use by the anthropologist Dr Donald Thomson, the first man to capture and milk a live taipan.
So far, four species/sub-species of the taipan have been identified. They are:
- the coastal taipan (Oxyuranus scutellatus scutellatus),
- the Papuan taipan (Oxyuranus scutellatus canni),
- the inland taipan (Oxyuranus microlepidotus), and
- the Central Ranges taipan (Oxyuranus temporalis).
This article will deal mainly with
O. s. scutellatus and
O. microlepidotus.
Distribution
The coastal taipan ranges in an arc along the east coast from northeastern New South Wales through Queensland and across the northern parts of the Northern Territory to northern Western Australia.
The inland taipan ranges from the southeast part of the Northern Territory into western Queensland. The snake can also be found north of Lake Eyre and to the west of the split of the Murray River, Darling River, and Murrumbidgee River.
Since taipans don't read maps all that well they sometimes appear outside the marked areas. Tread warily!
Description
The coastal taipan possesses the third most toxic land snake venom known and many human deaths have resulted from bites by this species.
It's a medium to large snake, with a robust build and a deep, rectangular-shaped head distinct from the slender neck. Body colour may be yellowish, reddish brown, dark brown or almost black. The species undergoes a seasonal change in colour, with individuals becoming darker in winter and fading in summer. The head is noticeably paler than the body, particularly in juveniles (the head will darken with age however the snout always remains pale). Dorsal scales may be slightly keeled, at least on the neck, otherwise smooth. The ventral surface is yellowish to cream with scattered orange blotches. Eyes are large, with an intense orange-brown iris and round pupil.
Coastal Taipan (Oxyuranus scutellatus)
Average full-grown length is around 2 metres (6½ feet), with males growing slightly larger than females. Individuals have been reported to grow to over 3 metres, however the largest wild-caught museum specimen reliably measured was a male with a snout-vent length of 2260mm. A huge captive bred Taipan donated to the Queensland Museum had a snout-vent length of 2425mm and a total length of 2900mm.
The inland taipan has the most toxic venom of any terrestrial snake species in the world.
Colour varies from a rich, dark tan to a brownish olive-green, depending on season. Its back, sides and tail may be different shades of brown and grey, with many scales having a wide blackish edge. These dark-marked scales occur in diagonal rows so that the marks align to form broken chevrons of variable length that are inclined backward and downward. The lowermost lateral scales often have an anterior yellow edge. The dorsal scales are smooth and without keels. The round-snouted head and neck are usually noticeably darker than the body (glossy black in winter, dark brown in summer), the darker colour allowing the snake to heat itself while only exposing a smaller portion of the body at the burrow entrance. The eye is of average size with a blackish brown iris and without a noticeable coloured rim around the pupil.
Inland Taipan (Oxyuranus microlepidotus)
The inland taipan averages approximately 1.8 metres (6 feet) in length, although larger specimens can reach lengths of 2.5 metres (8½ feet).
It is also known as the Small Scaled Snake and the Fierce Snake, although the latter is something of a misnomer since they are actually quite timid. It is this timidity, as well as the remoteness of their habitat, which results in them having achieved a far lower body count than their somewhat more aggressive coastal cousins.
Habitat
The coastal taipan is found in warm temperate to tropical coastal regions, in monsoon forest, wet and dry sclerophyll forest and woodland, and in natural and artificial grassy areas including grazing paddocks, disused rubbish tips, cane fields and (mwahahahaha!) back yards where there is often an abundance of rats and mice. Thickets of introduced lantana are also favoured habitat.
The coastal taipan shelters in abandoned animal burrows, hollow logs and piles of vegetation like that big mess of branches from last year's pruning that you've been meaning to get rid of.
The inland taipan lives here:
What's for lunch, Mum?
In the wild, taipans are known to feed only on warm-blooded prey such as mice, rats, bandicoots, tourists* and birds. Young taipans, in captivity at least, will also eat skinks. When hunting, the taipan appears to actively scan for prey using its well-developed eyesight, and is often seen travelling with its head raised above ground level. Once prey is detected the snake ‘freezes’ before hurling itself forward and issuing, in the case of the coastal taipan, one to several lightning-fast bites or in the case of the inland variety, a single, well-aimed bite.
The prey is then released and allowed to stagger away, a strategy which minimizes the snake’s chance of being harmed in retaliation, particularly by rats which can inflict lethal damage with their long incisors. After a few moments the Taipan tracks down the dying animal by following the scent trail with its flickering tongue.
* only the really little ones
You probably don't really want to be looking at a taipan from this angle
Breeding
Mating in captive coastal taipans and where observed in the wild appears to peak in late winter/early spring (although they can be encouraged to breed almost all year round).
Behaviour presumed to be male combat has been reported in wild taipans, involving two males entwining their bodies and ‘wrestling’ to push down the other’s head and neck. How a ‘winner’ is determined remains unclear, however by defeating and driving away competitors the successful male presumably gains greater access to any receptive females in the area.
Courtship observed in captive coastal taipans appears to follow the basic pattern seen in many other snake species. Upon encountering a receptive female the male becomes highly excited and moves up and along the body of the female, continually tongue-flicking and rubbing his chin against her.
Taipans are oviparous and two to three months after mating the female will lay between 3 and 21 soft-shelled eggs (average of 11), usually in a log hollow, under tree roots or in cavities in the ground. In captivity females often produce a second clutch many weeks after the initial mating – this suggests the female may be able to store sperm for several months.
Depending on the incubation temperature the eggs hatch between two and three months after being laid. The emerging young measure around 46 centimetres (18 inches) and are fully equipped with all the bitey bits and are ready to rock and roll. Taipans hatched in captivity grow incredibly fast, and can reach to over a metre in their first year. Growth rates for wild Taipans are not known, however the lack of small specimens in museum collections may suggest that the species grows rapidly under natural conditions as well.
Danger to humans
The coastal taipan is often regarded as the most dangerous snake in Australia, despite having less toxic venom than its inland mates. This is partly due to it's more aggressive nature and partly due to it's range being closer to where folks live.
Both species are extremely nervous and alert snakes and although, like any snake, they prefer to avoid conflict and will quietly slip away if given the chance, if surprised or cornered they will ferociously defend themselves.
When threatened, the taipan adopts a loose striking posture with its head and forebody raised. It inflates and compresses its body laterally and may also spread the back of its jaws to give the head a broader, lance-shaped appearance. Invariably the snake will strike, often without any warning, inflicting multiple snapping bites (in the case of the coastal taipan) or a single bite (in the case of the inland taipan) with extreme accuracy and efficiency.
The muscular lightweight body of the taipan allows it to hurl itself forwards or sideways and reach high off the ground, and such is the speed of the attack that a person may be bitten several times before even realising that the snake is there. Sucks to be you, human.
The fangs are the longest of any Australian elapid snake, being up to 12mm (½ inch) long, and are able to be brought forward slightly prior to striking.
When the coastal taipan strikes it injects a large amount of highly toxic venom deep into the flesh, and studies have shown they are capable of injecting the same amount in a second or third bite.
The venom affects the nervous system and the blood’s ability to clot, and victims may experience headache, nausea/vomiting, collapse, convulsions (especially in children), paralysis, internal bleeding, myolysis (destruction of muscle tissue), kidney damage and deadness. The onset of serious symptoms is often rapid, so anyone suspected of receiving a bite must seek medical attention immediately, no matter how trivial the bite may appear.
Prior to the introduction of specific antivenom by the Commonwealth Serum Laboratories in 1956, a Taipan bite was nearly always fatal and needless to say, if an inland taipan bites you somewhere out near
Cameron Corner you're more-or-less snookered.
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