Dr KARL SHUKER

Zoologist, media consultant, and science writer, Dr Karl Shuker is also one of the best known cryptozoologists in the world. He is the author of such seminal works as Mystery Cats of the World (1989), The Lost Ark: New and Rediscovered Animals of the 20th Century (1993; greatly expanded in 2012 as The Encyclopaedia of New and Rediscovered Animals), Dragons: A Natural History (1995), In Search of Prehistoric Survivors (1995), The Unexplained (1996), From Flying Toads To Snakes With Wings (1997), Mysteries of Planet Earth (1999), The Hidden Powers of Animals (2001), The Beasts That Hide From Man (2003), Extraordinary Animals Revisited (2007), Dr Shuker's Casebook (2008), Karl Shuker's Alien Zoo: From the Pages of Fortean Times (2010), Cats of Magic, Mythology, and Mystery (2012), Mirabilis: A Carnival of Cryptozoology and Unnatural History (2013), Dragons in Zoology, Cryptozoology, and Culture (2013), The Menagerie of Marvels (2014), A Manifestation of Monsters (2015), Here's Nessie! (2016), and what is widely considered to be his cryptozoological magnum opus, Still In Search Of Prehistoric Survivors (2016) - plus, very excitingly, his four long-awaited, much-requested ShukerNature blog books (2019-2024).

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Showing posts with label death adder. Show all posts
Showing posts with label death adder. Show all posts

Wednesday, 24 January 2024

THE HORN SNAKE AND THE HOOP SNAKE - FEARSOME CRITTERS OF THE SERPENTINE KIND

 
Hoop snake in hot pursuit! (© Richard Svensson)

Following on from my previous ShukerNature blog article chronicling what may well be North America's most familiar folkloric Fearsome Critter of any kind, the truly monstrous hodag (click here to access my article), I am now documenting the most (in)famous Fearsome Critters of the serpentine kind – namely, the horn snake and the hoop snake.

I must not forget, in these random sketches, my old friend and neighbour, Uncle Davy Lane...Nothing could move him out of a slow, horse-mill gait but snakes, of which "creeturs he was monstrous 'fraid." The reader shall soon have abundant evidence of the truth of this admission in his numerous and rapid flights from "sarpunts."...He became quite a proverb in the line of big story-telling. True, he had many obstinate competitors, but he distanced them all farther than he did the numerous snakes that "run arter him."...

"But at last I ventured to go into the face uv the Round Peak one day a-huntin.' I were skinnin' my eyes fur old bucks, with my head up, not thinkin' about sarpunts, when, by Zucks! I cum right plum upon one uv the cuiousest snakes I uver seen in all my borned days.

"Fur a spell I were spellbound in three foot uv it. There it lay on the side uv a steep presserpis, head big as a sasser, right toards me, eyes red as forked lightnin,' lickin' out his forked tongue, and I could no more move than the Ball Rock on Fisher's Peak. But when I seen the stinger in his tail, six inches long and sharp as a needle, stickin' out like a cock's spur, I thought I'd a drapped in my tracks. I'd ruther a hard uvry coachwhip [snake] on Round Hill arter me en full chase than to a bin in that drefful siteation.

"Thar I stood, petterfied with relarm — couldn't budge a peg - couldn't even take old Bucksmasher off uv my shoulder to shoot the infarnul thing. Nyther uv us moved nor bolted 'ur eyes fur fifteen minits.

"At last, as good luck would have it, a rabbit run close by, and the snake turned its eyes to look what it were, and that broke the charm, and I jumped forty foot down the mounting, and dashed behind a big white oak five foot in diamatur. The snake he cotched the eend uv his tail in his mouth, he did, and come rollin' down the mounting arter me just like a hoop, and jist as I landed behind the tree he struck t'other side with his stinger, and stuv it up, clean to his tail, smack in the tree. He were fast.

"Of all the hissin' and blowin' that uver you hearn sense you seen day­light, it tuck the lead. Ef there'd a bin forty-nine forges all a-blowin' at once, it couldn't a beat it. He rared and charged, lapped round the tree, spread his mouf and grinned at me orful, puked and spit quarts an' quarts of green pisen at me, an' made the ar stink with his nasty breath.

"I seen thar were no time to lose; I cotched up old Bucksmasher from whar I'd dashed him down, and tried to shoot the tarnil thing; but he kep' sich a movin' about and sich a splutteration that I couldn't git a bead at his head, for I know'd it warn't wuth while to shoot him any whar else. So I kep' my distunce tell he wore hisself out, then I put a ball right be­tween his eyes, and he gin up the ghost.

"Soon as he were dead I happened to look up inter the tree, and what do you think? Why, sir, it were dead as a herrin'; all the leaves was wilted like a fire had gone through its branches.

"I left the old feller with his stinger in the tree, thinkin' it were the best place fur him, and moseyed home, 'tarmined not to go out again soon..."

   H.E. TaliaFerro ('Skitt') – 'Uncle Davy Lane'

Over the years, the annals of zoology have received and dutifully logged various reports of some truly remarkable pseudo-serpents, i.e. false snakes once deemed to be genuine species but subsequently exposed as imaginative folktales, deceiving hoaxes, or monstrous misidentifications. One of the most intriguing examples is the North American horn snake – not least because it is actually two pseudo-serpents in one! Moreover, as noted above, both of them are derived from the rich Fearsome Critters folklore of this New World continent's early lumberjacks and other rural pioneers.

The earliest notable account of the horn snake appeared in American explorer John Lawson's important work A New Voyage to Carolina (1709; retitled The History of Carolina in later editions), whose description succinctly includes all of the principal characteristics of this singular, highly controversial reptile:

Of the Horn Snake, I never saw but two that I remember. They are like the Rattlesnake in Colour, but rather lighter. They hiss exactly like a Goose when anything approaches them. They strike at their Enemy with their Tail, and kill whatsoever they wound with it, which is armed at the End with a Horny Substance like a Cock's Spur. This is their Weapon. I have heard it credibly reported by those who said they were Eye-Witnesses, that a small Locust Tree, about the Thickness of a Man's Arm, being struck by one of these Snakes at Ten o'clock in the Morning, then verdant and flourishing, at Four in the Afternoon was dead, and the Leaves dead and withered. Doubtless, be it how it will, they are very venomous. I think the Indians do not pretend to cure their wound.

 
Front cover of John Lawson's 1709 book A New Voyage to Carolina (public domain)

In the 1722 self-revised edition of his 1705 tome History and Present State of Virginia, Virginia historian and government official Colonel Robert Beverley emphasised the nature of the horn snake's stinging tail as a formidable weapon:

There is likewise a Horn Snake, so called from a Sharp Horn it carries in its Tail, with which it assaults anything that offends it, with that Force that, as it is said, it will strike its Tail into the Butt End of a Musket, from whence it is not able to disengage itself.

The first naturalist to document the horn snake in detail was Mark Catesby, in the first volume of his major work The Natural History of Carolina, Florida and the Bahama Islands (1731), summarising the descriptions provided previously by Lawson and Beverley, but discounting its tail's deadly nature as outrageous fiction and identifying its species as a 'water viper', to which he gave the formal name Vipera aquatica. According to Catesby, the horn snake's tail-sting or spine was merely a blunt, horny, and completely innocuous structure about half an inch long.

 
Water moccasin, threat display (public domain)

Curiously, however, the species that he dubbed Vipera aquatica and labelled as the horn snake is traditionally believed to have been the water moccasin Agkistrodon piscivorus - the world's only species of semi-aquatic viper. Yet although it does possess a short, thick, blunt-ended tail, the latter does not bear a spine at its tip. Consequently, some modern-day herpetologists dispute that Catesby's so-called 'water viper' (and thence his horn snake) was indeed the water moccasin.

Notwithstanding Catesby's scepticism regarding the venomous nature of the horn snake's tail spine, this feature was steadfastly reiterated in subsequent accounts elsewhere (so too was the claim that this species was reddish or at least partly reddish in colour). And to complicate matters still further, a second, even more fantastic, zoologically-implausible characteristic was soon attributed to this already much-muddled mystery snake – the supposed ability to turn itself into a vertical hoop by grasping its tail in its jaws just like the mythical ouroboros, thereby enabling it to roll along the ground at great speed like a living tyre. When carrying out this bizarre mode of locomotion, the horn snake thus became known as the hoop snake.

 
Ouroboros drawing from a late medieval Byzantine Greek alchemical manuscript (public domain)

An early hoop snake account was penned by American traveller J.F.D. Smyth in 1784, following a stay in western North Carolina, and was published in Volume 1 of his multi-tome travelogue Tour in the United States of America. After describing the by now familiar morphological characteristics of the horn snake, Smyth added the following very remarkable behavioural information:

As other serpents crawl upon their bellies, so can this; but he has another method of moving peculiar to his own species, which he always adopts when he is in eager pursuit of his prey; he throws himself into a circle, running rapidly around, advancing like a hoop, with his tail arising and pointed forward in the circle, by which he is always in the ready position of striking.

It is observed that they only make use of this method in attacking; for when they fly from their enemy they go upon their bellies, like other serpents.

From the above circumstance, peculiar to themselves, they have also derived the appellation of hoop snakes.

The next couple of centuries saw many published reports of hoop-rolling horn snakes – hailing from a wide geographical spread, including the Minnesota-Wisconsin border, North Carolina, and British Columbia in Canada - despite their self-evident improbability. A typical example, which concisely contains all of the intrinsic horn/hoop snake motifs, is the following account, published on 8 November 1884 by an Australian newspaper entitled the Maitland Mercury and Hunter River General Advertiser but documenting an alleged incident that took place in Virginia, USA:

One day last week a little girl, whose name slipped the correspondent's usually retentive memory, was chased by a monster hoop snake nearly a mile. Just as it seemed that it was about to strike her, she dodged behind a large apple tree. The rapidly whirling snake turned to follow and struck the tree with such force as to drive the horn-spike into the hard wood over two inches. The child was so frightened that she sank down, her heart thumping as though it would burst out of her body.

One of her brothers, who had seen her flying down the hill, went to see what was the matter. When he reached the tree it was quaking like an aspen and its leaves and fruit falling to the ground in a perfect shower, the prostrate girl being almost buried beneath them. As soon as he got her restored to consciousness he took a fence rail and killed the venomous reptile, which was eleven feet two and a half inches in length and eight inches in circumference. The horn point on the tail was six and a half inches long, and so deeply imbedded in the hard wood that it could not extricate itself. This all happened near South Mountain, Va [Virginia].

With the girl's name conveniently forgotten, the correspondent responsible for the account not named, and the eminently unlikely nature of the entire incident, the most reasonable assumption is that this incident, like so many others of its kind involving extraordinary, unbelievable beasts, was a journalistic invention. Yet even today, supposedly serious reports of hoop-rolling horn snakes are still being documented, thus sitting uncomfortably alongside unequivocally tongue-in-cheek, light-hearted versions, cartoons, and other jokey representations of this classic pseudo-serpent.

 
Raymond Ditmars (public domain)

Moreover, it is nothing if not telling that although celebrated American snake expert Raymond Ditmars (1876-1942) placed 10,000 dollars in trust at a New York bank to be awarded to the first person who provided him with conclusive evidence for the reality of the hoop snake, this very substantial prize was never claimed.

But are reports of horn and hoop snakes absolutely fictional, or could there be at least a kernel of truth at the heart of such ostensibly unfeasible tales? Quite apart from the fact that there are many fully-attested sightings of snakes grasping their tails in their mouths (albeit while lying on the ground, and therefore yielding horizontal circles rather than the hoop snake's vertical ones), there are certain fully-recognised species of North American snake that do bear a spiny structure at the tip of their tail. So it may be that some of these latter species have helped inspire and shape the legend of the horn snake.

 
Mud snake (© John Sullivan/Wikipedia – CC BY-SA 3.0 licence)

One of the leading candidates for this role is the mud snake Farancia abacura, a semi-aquatic, non-venomous species of colubrid native to the southeastern USA. Up to 6 ft long, black dorsally, black and orange ventrally (with the orange sections extending upwards laterally, thereby corresponding with certain horn snake accounts referring to reddish-orange sides), this distinctive snake has only a short tail, but it bears a noticeable spine at its tip, which in reality is a greatly-enlarged terminal scale of hard, horny constituency and quite sharp at its tip. Of course, the spine is not venomous, but this species shares a sufficient number of other characteristics with the legendary horn snake – both the tail spine and the shortness of the tail itself, a tendency to prod prey with its tail spine, plus orange flanks, and a water-frequenting preference – for there to be little doubt that it has actively influenced traditional, non-scientific belief in sting-tailed horn snakes.

Certainly, eminent American herpetologist Dr Karl P. Schmidt (1890-1957) favoured this identity for the latter pseudo-serpent when documenting the horn/hoop snake saga in an article published in the January/February 1925 issue of the American periodical Natural History. This theory has also been championed much more recently, by another American herpetologist, Dr J.D. Wilson, in a mud snake article published by the Savannah River Ecology Laboratory in 2006, and not only for the horn snake specifically but also for its locomotory hoop snake alter ego. A closely-related species, the rainbow snake F. erytrogramma, which again is semi-aquatic, non-venomous, native to the southeastern USA, and very similar to the mud snake by virtue of its body colouration, short tail, and readily-visible tail spine, is actually referred to colloquially as the hoop snake across much of its geographical range.

 
Coachwhip snake (public domain)

Yet another North American non-venomous colubrid that has been implicated with the hoop snake legend is the coachwhip snake Masticophis flagellum, endemic to the southern USA and also northern Mexico. Up to 6.5 ft long, this species is sometimes reddish-pink in colour, recalling once again descriptions of the horn snake.

Moreover, although it does not possess a tail spine, it is a fast-moving, very agile species, and Schmidt, among others, has suggested that the hoop snake component of the horn snake myth may have originated from sightings of species like this one (as well as fellow non-venomous North American colubrid the common black snake Coluber constrictor – and in particular its most distinctive subspecies, the blue racer C. c . foxii) gliding along at great speed and in an undulating manner over the tops of bushes without descending to the ground, thus recalling the hoop snake's supposed rolling mode of progression.

 
Common black snake (public domain)

Interestingly, horn and hoop snake traditions are not exclusive to North America. Comparable tales have been recorded from Australia too. This island continent is home to the highly venomous death adders – a genus (Acanthophis) of viper-impersonating elapids whose several species are all famed for their very conspicuous tail spine.

Central and West Africa are also sources of sting-tailed horn/hoop snake reports, which in this case appear to have been inspired by harmless blind burrowing snakes of the genus Typhlops, which possess very prominent tail spines. Moreover, Schmidt suggested that slaves brought to North America from these regions of Africa may have contributed to the New World horn snake folklore by recalling stories of African burrowing snakes that subsequently became transferred to America's own equivalent species (though not of the genus Typhlops, as this is confined to Central and South America in the New World).

 
An Australian death adder (public domain)

Yet regardless of the varied scientific explanations documented and discussed that discount the horn and hoop snake as being wholly fictitious, belief in the reality and lethal nature of these pseudo-serpents is still deeply ingrained among great swathes of the general public across North America and elsewhere. So much so, in fact, that it seems likely that their origins will forever remain controversial, and with any investigations of scientifically-untrained eyewitness reports destined merely to go round and round in circles – just like the hoop snake itself!

Having said that, however, no article on hoop snakes could possibly close without mentioning a truly remarkable somersaulting snake from the Philippines. Courtesy of a fascinating video produced by a longstanding cryptozoological friend, Tony Gerard, there is conclusive proof of at least one species of snake's extraordinary ability to make dramatic somersaulting leaps through the air when fleeing a perceived threat.

 
Northern triangle-spotted snake (© R. Brown et al., 2013/Wikipedia CC BY 3.0 licence)

The species in question is the northern triangle-spotted snake Cyclocorus lineatus, a small, non-venomous member of the very diverse, elapid-related taxonomic family Lamprophiidae and endemic to the Philippines. The video (posted here on YouTube by American herpetologist/cryptozoologist Chad Arment as StrangeArk on 19 May 2019) shows Tony with one of these snakes held briefly under a bowl. When Tony lifts up the bowl and gently prods the snake, it rapidly flees via a series of very dramatic somersaulting leaps through the air and across the ground, so that it bears more than a passing resemblance to the fabled hoop snake.

Indeed, the only reason why I am including it here, rather than in an article dealing with jumping snakes, is that whereas the hoop snake was said to turn itself into a hoop by gripping its tail in its mouth and then rolling along like a vertical hoop or wheel, this Philippines snake engenders its superficially hoop-like appearance by way of repeated somersaulting leaps, without ever grasping its tail in its mouth.

 
Vintage sketch of a hoop snake by Margaret R. Tryon (public domain)

Nevertheless, the overall visual effect is similar enough to make me wonder if other snakes can also accomplish such somersaults and, in turn, whether the hoop snake tales originated from sightings of snakes performing this acrobatic ability, with the tail-in-mouth detail being subsequently added in elaborated retellings. From such are myths, legends, and folktales born.

This ShukerNature article is excerpted and adapted from my book Secret Snakes and Serpent Surprises, published by Coachwhip Publications.



Saturday, 4 August 2012

THE MONGOLIAN DEATH WORM – A SHOCKING SURPRISE IN THE GOBI?

The Mongolian death worm - shocking and spraying! (Philippa Foster)


It's not every day – or every expedition – that begins with a request from a country's head of government formally requesting that a specimen be captured of a creature so elusive, and deadly, that western science does not even recognise its existence. Nevertheless, that is precisely what happened in 1922 when eminent American palaeontologist Prof. Roy Chapman Andrews met the Mongolian premier in order to obtain the necessary permits for the American Museum of Natural History's Central Asiatic Expedition to search for dinosaur fossils in the Gobi Desert. And the creature that the Mongolian premier instructed him to procure? None other than the lethal allghoi khorkhoi – or, as it is nowadays commonly referred to throughout the world, the Mongolian death worm.

Ivan Mackerle (Ivan Mackerle)

Although in the 1920s, this extraordinary mystery beast was totally unheard of outside Mongolia, today it is one of the most (in)famous of all cryptozoological creatures – thanks to the series of pioneering expeditions to its southern Gobi homeland launched by Czech explorer Ivan Mackerle, the first of which took place during June and July 1990, and which subsequently attracted considerable interest internationally. During his searches, Ivan collected a very impressive dossier of information concerning the death worm, based upon eyewitness reports and other anecdotal evidence, which he subsequently made freely available to me to use as I wished in my own writings, and which can be summarised as follows.

Its local names – allghoi khorkhoi and allergorhai horhai – translate as 'intestine worm', because according to eyewitness testimony, this mysterious sausage-shaped creature resembles a living intestine. Red in colour with darker blotches, it measures 1-1.6 m long and is as thick as a man's arm, but has no discernable scales, mouth, nor even any eyes or other recognisable sensory organs. It is said to be truncated at both ends, but according to some accounts at least one end also bears a series of long pointed structures at its tip.

Illustration of Mongolian death worm based upon eyewitness descriptions (Ivan Mackerle)

For much of the year, the death worm remains concealed beneath the Gobi's sands, but during the two hottest months – June and July – it can sometimes be encountered lying on the surface, particularly after a downpour of rain.

Black saxaul

Locals claim that it can also be found in association with the black saxaul Haloxylon ammodendron, a yellow-flowered desert shrub, whose roots are parasitized by the goyo Cynomorium songaricum – a strange, cigar-shaped plant of uncertain taxonomic affinities.

Goyo plants (Ivan Mackerle)

According once again to local lore, the death worm is deadly for two very different reasons. If approached too closely, it is said to raise one end of its body upwards (as portrayed on the front cover of my book The Beasts That Hide From Man, 2003), and then squirt with unerring accuracy at its victim a stream of extremely poisonous, acidic fluid that burns the victim's flesh, turning it yellow, before rapidly inducing death. It is claimed that the death worm derives this highly toxic substance externally - either from the saxaul's roots or from the goyo attached to them (and thereby reminiscent of how South America's deadly arrow-poison frogs derive their skin toxins from certain small arthropods that they devour). During my own researches, however, I have uncovered no evidence to suggest that the saxaul's roots are poisonous, and I have revealed that the goyo is definitely not poisonous (it is eaten as famine food, and used widely in Chinese herbalism). So if the death worm truly emits a venomous fluid, it presumably manufactures it internally, rather than deriving it externally.

Model of Mongolian death worm emerging from sand (Markus Bühler)

Even more shocking – in every sense! – is the death worm's second alleged mode of attack. Nomadic herders inhabiting the southern Gobi tell of how entire herds of camels have been killed instantly merely by walking over a patch of sand concealing a death worm beneath the surface. Moreover, one of Ivan Mackerle's local guides recalled how, many years earlier, a geologist visiting the Gobi as part of a field trip was killed when he began idly poking some sand one night with an iron rod – as he did so, he abruptly dropped to the ground, dead, for apparently no reason, but when his horrified colleagues rushed up to him, they saw the sand where he had been poking the rod suddenly begin to churn violently, and from out of it emerged a huge, fat death worm.

The camels presumably died from coming into direct physical contact with the death worm hidden beneath their feet, but the geologist only touched it indirectly, via the metal rod. Consequently, the only conceivable way that this action could have caused his death is by electrocution – which would obviously explain the camels' instant deaths too. Although there are several different taxonomic groups of fish containing species that can generate electricity – including the famous electric eel and gymnotids, as well as the electric catfish, electric rays, mormyrids, rajid skates, and electric stargazers – no known species of terrestrial creature possesses this ability. So if the native claims concerning the camels and the geologist are correct, and always assuming of course that it really does exist, the death worm must be a very special animal indeed. But what precisely could it be?

Mongolian death worm (www.static.environmentalgraffiti.com)

Despite its English name and superficially similar external appearance, it is highly unlikely that the death worm could be a bona fide earthworm or related invertebrate. For although some earthworms do grow to prodigious lengths, and certain species known aptly as squirters even spurt streams of fluid from various body orifices, none exhibits a water-retentive cuticle, which would be imperative for survival in desert conditions to avoid drying out. Of course, there may be a highly-specialised earthworm in the Gobi that has indeed evolved such a modification, but with no precedent currently known, the chances of this seem slim. In addition, if the death worm's powers of electrocution are real, this would require even more modification and specialisation for an earthworm to fit the bill.

Caecilians constitute a taxonomic order of limbless amphibians that are deceptively worm-like in appearance and predominantly subterranean in lifestyle. Certain species can also attain a total length matching the dimensions reported for the death worm. As with true worms, however, caecilians' skin is water-permeable, so once again even a giant caecilian would soon dry out in the arid Gobi, unless, uniquely among these particular amphibians, it had evolved a water-retentive skin.

19th-Century engraving of a caecilian, Siphonops

If the death worm is genuine, it is almost certainly some form of reptile. To my mind, the likeliest solution is an unusually large species of amphisbaenian. On account of their vermiform appearance (most species are limbless), these little-known reptiles are also called worm-lizards, even though, taxonomically speaking, they are neither. As with caecilians, they spend much of their lives underground, rarely coming to the surface except after a heavy fall of rain. This all corresponds well with the death worm's reported behaviour. Furthermore, unlike real worms and caecilians the skin of amphisbaenians is water-retentive, so a giant species would not dry out in the Gobi.

Two Iberian amphisbaenians Blanus cinereus (Richard Avery/Wikipedia)

Conversely, whereas the death worm is said to be smooth externally, amphisbaenians are very visibly scaly, and they also have a readily-observed mouth. In addition, they are all completely harmless, which wholly contradicts the twin death-dealing talents attributed to the Gobi's moat greatly-feared denizen. Naturally, it is conceivable that these abilities are entirely apocryphal, nothing more substantial than superstitious fancy. After all, several known species of amphisbaenian, and also caecilian, are fervently believed by their local human neighbours to be deadly poisonous even though in reality they are wholly innocuous.

19th-Century engraving of an amphisbaenian

Much of what has been proposed for and against an amphisbaenian identity for the Mongolian death worm applies equally to the possibility of its being an unknown species of very large legless true lizard - akin perhaps to the familiar slow worm and glass snake, or even to the skinks, some species of which are limbless. However, these lizards are much less worm-like and subterranean than amphisbaenians, so overall the latter provide a more satisfactory match with the death worm.

Mexican ajolote - possessing a pair of extremely small forelegs, this is the only type of amphisbaenian with any limbs at all (picture source unknown to me)

Last, but by no means least, is the thought-provoking prospect that the death worm may be a highly specialised species of snake. Not only do most of the above-noted physical and behavioural similarities between the death worm and the amphisbaenians and legless lizards apply here too, but spitting cobras also offer a famous precedent for an elongate creature that can eject a stream of corrosive venom with deadly accuracy at a potential aggressor. Moreover, the spine-bearing tip described for the death worm recalls a genus of cobra-related species known as death adders Acanthophis spp., which possess a spiny worm-like projection at the tip of their tail that acts as a lure for potential prey.

Death adder

Their name recognises the fact that although, like cobras, they are elapids, the death adders have evolved to occupy the ecological role filled elsewhere by true vipers. Could there be a specialised, unknown species of death adder that has evolved the venom-spitting ability of its spitting cobra relatives? If so, this would vindicate the locals' testimony concerning the death worm's emissions. But what about its alleged powers of electrocution?

Remarkably, this too may be more than just a myth. For if the death worm were indeed a snake and perhaps sported such smooth, fine, tiny scales that they were not readily discernable, when it was crawling through sand these scales may be able to generate a weak electrical current via friction – a process known as triboelectricity, which has already been documented from certain sand-dwelling snake species. If this in turn gave rise to exaggerated descriptions of its potency, it is easy to see how, over the course of several generations of ever more fanciful retellings, the entirely false belief in a creature that kills by electrocution could ultimately arise.

Mongolian death worm as visualised by renowned graphics artist Andy Paciorek (Andy Paciorek)

So could it be that in spite of the death worm's initially unlikely form and behavioural proclivities, there actually could be a real, scientifically-undescribed species at the heart of this longstanding mystery, albeit one far less flamboyant and formidable than the version described in local testimony? Or is the entire death worm scenario nothing more than native folklore?

Science-fiction devotees reading about the Mongolian death worm will undoubtedly recall Frank Herbert’s celebrated series of 'Dune' novels. These were set on a desert planet called Arrakis – home to an enormous species of vibration-sensitive sand worm called the shai-hulud, which could be ‘called’ to the surface when the planet’s human inhabitants used a vibration-engendering device known as a thumper.

The shai-hulud or giant sand worm of Arrakis in Frank Herbert's 'Dune' novels (picture source unknown to me)

In a classic scenario of transforming science-fiction into science fact, and directly inspired by the 'Dune' stories, during his first Gobi expedition Mackerle and his team tested out their very own specially-constructed thumper, but to no effect. During their second Gobi expedition, clearly favouring a more emphatic approach this time, they set off a number of controlled explosions in areas said by the locals to harbour subterranean death worms, in the hope that the massive vibrations elicited by these explosions would stimulate the worms to surface. Sadly, however, their summoning again went unheeded, as no worms appeared.

Model of the Mongolian death worm (Takeshi Yamada)

Moreover, in recent times several expeditions other than those of Ivan Mackerle have also searched the southern Gobi's vast terrain in search of its purported 'monster', but once again none has met with any success so far.

These include an expedition led by English cryptozoological field researcher Adam Davies in 2003, a team sent out by the Centre for Fortean Zoology in 2005, and more recently a two-man expedition led by New Zealand journalist David Farrier in August 2009. Unfortunately, none succeeded even in seeing, let alone capturing, a death worm (a local man informed the CFZ team that on one occasion a killed specimen had been taken away by Russian zoologists, but he did not provide any names or details that could be pursued). Nevertheless, some informative anecdotal evidence has been gathered, and both the Adam Davies-led team and the CFZ team observed and photographed a carving of a supposed death worm (although it sported eyes) on exhibition at the remote Gobi Museum.

'Mongolian Death Worm' - an action-packed made-for-television sci-fi film from 2010, in which the heroes battle gigantic specimens far bigger than anything reported in real life by the Gobi nomads (Syfy)

Most telling of all, however, as some of these later expeditions were startled to discover, the newest generation of Gobi nomads are as likely to be riding desert motorbikes as camels, and some even carry mobile phones inside the folds of their traditional desert robes. So perhaps they are also heeding less and less the traditional stories and beliefs of their elders.

'Tremors' - one of my all-time favourite monster movies, this is a wonderfully tongue-in-cheek sci-fi film from 1990 featuring gigantic desert-concealed worms in the USA

Having said that, there may be another, very different reason why these expeditions have returned empty-handed. Some locals claim that death worms have been seen far less frequently in recent years than in the past. Who knows - perhaps, just as the rest of the world has finally started to learn about and become interested in it, the Mongolian death worm has begun slipping inexorably into extinction.

Mongolian death worm (Alex Tomlinson)

How ironic that would be – almost as ironic, in fact, as Prof. Roy Chapman Andrews's straight-faced promise to the Mongolian premier back in 1922 that if his expedition did indeed encounter a death worm during their search for dinosaur fossils in the Gobi, they would do their best to secure its capture using a pair of long steel collecting forceps. In view of what reputedly happened to the hapless geologist who poked one of these fearful creatures with a metal rod, it's probably just as well that Prof. Andrews and his team never did find any!

For the most detailed, comprehensive coverage of the Mongolian death worm ever published, see my book The Beasts That Hide From Man (Paraview: New York, 2003).

The Beasts That Hide From Man, featuring one of Ivan Mackerle's Mongolian death worm illustrations on its front cover (Dr Karl Shuker)