Vipera berus,also known as thecommon European adder[3]and thecommon European viper,[4]is aspeciesofvenomous snakein thefamilyViperidae.The species is extremely widespread and can be found throughout much ofEurope,and as far asEast Asia.[2]There are three recognisedsubspecies.
| Common European adder | |
|---|---|
| |
Scientific classification
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Squamata |
| Suborder: | Serpentes |
| Family: | Viperidae |
| Genus: | Vipera |
| Species: | V. berus
|
| Binomial name | |
| Vipera berus | |
| |
| Synonyms[2] | |
|
IMG_1254.jpeg (1) Species synonymy
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Known by a host of common names includingcommon adderandcommon viper,the adder has been the subject of much folklore in Britain and other European countries.[5]It is not regarded as especially dangerous;[3][page needed]the snake is not aggressive and usually bites only when really provoked, stepped on, or picked up. Bites can be very painful, but are seldom fatal.[6]Thespecific name,berus,isNeo-Latinand was at one time used to refer to a snake, possibly the grass snake,Natrix natrix.[7]
The common adder is found in different terrains,habitatcomplexity being essential for different aspects of its behaviour. It feeds on smallmammals,birds,lizards,andamphibians,and in some cases onspiders,worms,andinsects.The common adder, like most other vipers, isovoviviparous.Females breed once every two or three years, with litters usually being born in latesummerto earlyautumnin the Northern Hemisphere. Litters range in size from three to 20 with young staying with their mothers for a few days. Adults grow to a total length (including tail) of 60 to 90 cm (24 to 35 in) and a mass of 50 to 180 g (1.8 to 6.3 oz)[citation needed].Threesubspeciesare recognised, including thenominate subspecies,Vipera berus berusdescribed here.[8]The snake is not considered to be threatened, though it is protected in some countries.
Taxonomy
editThere are three subspecies ofV. berusthat are recognised as being valid including thenominotypical subspecies.
| Subspecies[8] | Taxon author[8] | Common name | Geographic range |
|---|---|---|---|
| V. b. berus | (Linnaeus,1758) | Common European Adder[3][page needed] | Norway,Sweden,Finland,Latvia,Estonia,Lithuania,France,Denmark,Germany,Austria,Switzerland,Northern Italy,Belgium,Netherlands,Great Britain,Poland,Croatia,Czech Republic,Slovakia,Slovenia,Hungary,Romania,Russia,Ukraine,Mongolia,Northwest China(northXinjiang) |
| V. b. bosniensis | Boettger,1889 | Balkan Cross Adder[9] | Balkan Peninsula |
| V. b. sachalinensis | Zarevskij,1917 | Sakhalin Island Adder[10] | Russian Far East (Amur Oblast,Primorskye Kray,Khabarovsk Kray,Sakhalin Island),North Korea,Northeast China(Jilin) |
The subspeciesV. b. bosniensisandV. b. sachalinensishave been regarded as full species in some recent publications.[3][page needed]
The name 'adder' is derived fromnædre,anOld Englishword that had the generic meaning ofserpentin the older forms of many Germanic languages. It was commonly used in the Old English version of theChristianScripturesfor the devil and the serpent in theBook of Genesis.[5][11]In the 14th century, 'a nadder' inMiddle Englishwasrebracketedto 'an adder' (just as 'a napron' became 'an apron' and 'anompere'changed into 'an umpire').
In keeping with its wide distribution and familiarity through the ages,Vipera berushas a large number of common names in English, which include:
- Common European adder,[3][page needed]common European viper,[4]European viper,[12]northern viper,[13]adder,common adder,crossed viper,European adder,[10]common viper,European common viper,cross adder,[9]orcommon cross adder.[14]
In Welsh, it is calledgwiber,a name derived from Latinvīpera.In Denmark, Norway and Sweden, the snake is known ashugorm,hoggormandhuggorm,roughly translated as 'striking snake'. In Finland, it is known askyykäärmeor simplykyy,in Estonia it is known asrästik,while in Lithuania it is known asangis.In Poland the snake is calledżmija zygzakowata,which translates as 'zigzag viper', due to the pattern on its back.
Description
editRelatively thick-bodied, adults usually grow to 60 cm (24 in) in total length (including tail), with an average of 55 cm (22 in).[3][page needed]Maximum size varies by region. The largest, at over 90 cm (35 in), are found in Scandinavia; specimens of 104 cm (41 in) have been observed there on two occasions. In France and Great Britain, the maximum size is 80–87 cm (31–34 in).[3][page needed]Mass ranges from 50 g (1.8 oz) to about 180 grams (6.3 oz).[15][16]
The head is fairly large and distinct and its sides are almost flat and vertical. The edge of the snout is usually raised into a low ridge. Seen from above, therostral scaleis not visible, or only just. Immediately behind the rostral, there are two (rarely one) small scales.
Dorsally, there are usually five large plates: a squarishfrontal(longer than wide, sometimes rectangular), twoparietals(sometimes with a tiny scale between the frontal and the parietals), and two long and narrowsupraoculars.The latter are large and distinct, each separated from the frontal by one to four small scales. The nostril is situated in a shallow depression within a largenasal scale.
The eye is relatively large—equal in size or slightly larger than the nasal scale—but often smaller in females. Below the supraoculars are six to 13 (usually eight to 10) smallcircumorbital scales.Thetemporal scalesare smooth (rarely weakly keeled). There are 10–12sublabialsand six to 10 (usually eight or 9)supralabials.Of the latter, the numbers 3 and 4 are the largest, while 4 and 5 (rarely 3 and 4) are separated from the eye by a single row of small scales (sometimes two rows in alpine specimens).[3]
Midbody there are 21dorsal scalesrows (rarely 19, 20, 22, or 23). These are stronglykeeled scales,except for those bordering theventral scales.These scales seem loosely attached to the skin and lower rows become increasingly wide; those closest to the ventral scales are twice as wide as the ones along the midline. The ventral scales number 132–150 in males and 132–158 in females. Theanal plateis single. Thesubcaudalsare paired, numbering 32–46 in males and 23–38 in females.[3][page needed]
The colour pattern varies, ranging from very light-coloured specimens with small, incomplete, dark dorsal crossbars to entirely brown ones with faint or clear, darker brown markings, and on to melanistic individuals that are entirely dark and lack any apparent dorsal pattern. However, most have some kind of zigzag dorsal pattern down the entire length of their bodies and tails. The head usually has a distinctive dark V or X on the back. A dark streak runs from the eye to the neck and continues as a longitudinal series of spots along the flanks.[3][page needed]
Unusually for snakes, it is often possible to distinguish the sexes by their colour. Females are usually brownish in hue with dark-brown markings, the males are pure grey with black markings. The basal colour of males will often be slightly lighter than that of the females, making the black zigzag pattern stand out. The melanistic individuals are often females.
Distribution and habitat
edit
Vipera berushas a wide range. It can be found across theEurasianland-mass; fromnorthwestern Europe(Great Britain,Belgium,Netherlands,Scandinavia,Germany,France) acrosssouthern Europe(Italy,Serbia,Albania,Croatia,Montenegro,Bosnia and Herzegovina,North Macedonia,Bulgaria,and northernGreece) andeastern Europeto north of theArctic Circle,and Russia to the Pacific Ocean,Sakhalin Island,North Korea,northernMongoliaand northern China. It is found farther north than any other snake species.[citation needed]Thetype localitywas originally listed as 'Europa'. Mertens and Müller (1940) proposed restricting the type locality to Uppsala, Sweden[2]and it was eventually restricted to Berthåga, Uppsala by designation of aneotypeby Krecsák & Wahlgren (2008).[17]
In several European countries, it is notable as being the only native venomous snake. It is one of only three snake species native to Britain. The other two, thebarred grass snakeand thesmooth snake,are non-venomous.[18]
Sufficient habitat complexity is a crucial requirement for the presence of this species, in order to support its various behaviours—basking, foraging, and hibernation—as well as to offer some protection from predators and human harassment.[3][page needed]It is found in a variety of habitats, including: chalky downs, rocky hillsides, moors, sandy heaths, meadows, rough commons, edges of woods, sunny glades and clearings, bushy slopes and hedgerows, dumps, coastal dunes, and stone quarries. It will venture into wetlands if dry ground is available nearby and thus may be found on the banks of streams, lakes, and ponds.[19]
In much ofsouthern Europe,such as southern France and northern Italy, it is found in either low lying wetlands or at high altitudes. In theSwiss Alps,it may ascend to about 3,000 m (9,800 ft). In Hungary and Russia, it avoids open steppeland; a habitat in whichV. ursiniiis more likely to occur. In Russia, however, it does occur in the forest steppe zone.[19]
Conservation status
edit
InGreat Britain,it is illegal to kill, injure, harm or sell adders under theWildlife and Countryside Act 1981.[20]The same situation applies toNorwayunder theViltloven(The Wildlife Act 1981)[21]and Denmark (1981).[22]In Finland (Nature Conservation Act 9/2023) killing an adder is legal if it's not possible to capture and transfer it to another location[23]and the same provision also applies in Sweden.[24]The common viper is categorised as 'endangered' in Switzerland,[25]and is also protected in some other countries in its range. It is also found in manyprotected areas.[1]
This species is listed as protected (Appendix III) under theBerne Convention.[26]
TheInternational Union for Conservation of NatureRed List of Threatened Speciesdescribes the conservation status as of 'least concern' in view of its wide distribution, presumed large population, broad range of habitats, and likely slow rate of decline though it acknowledges the population to be decreasing.[27]Reduction in habitat for a variety of reasons, fragmentation of populations in Europe due to intense agriculture practices, and collection for the pet trade or for venom extraction have been recorded as major contributing factors for its decline.[1]A citizen science based survey in the UK found evidence of extensive population declines in the UK, especially affecting smaller populations.[28]A combination of public pressure and disturbance,habitat fragmentationand poor habitat management were considered the most likely causes of the decline. The release of 47 million non-native pheasants and 10 million partridges each year by countryside estates has also been suggested to have a significant impact on adder populations across the UK, with the possibility the reptile could be extinct by 2032.[29]
Behaviour
edit
This species is mainlydiurnal,especially in the north of its range. Further south it is said[30]to be active in the evening, and it may even be active at night during the summer months. It is predominantly a terrestrial species, although it has been known to climb up banks and into low bushes in order to bask or search for prey.[19]
Adders are not usually aggressive, tending to be rather timid and biting only when cornered or alarmed. People are generally bitten only after stepping on them or attempting to pick them up. They will usually disappear into the undergrowth at a hint of any danger, but will return once all is quiet, often to the same spot. Occasionally, individual snakes will reveal their presence with a loud and sustained hissing, presumably to warn off potential aggressors. Often, these turn out to be pregnant females. When the adder is threatened, the front part of the body is drawn into an S-shape to prepare for a strike.[19]
The species is cold-adapted andhibernatesin the winter. In Great Britain, males and females hibernate for about 150 and 180 days, respectively. In northern Sweden hibernation lasts 8–9 months. On mild winter days, they may emerge to bask where the snow has melted and will often travel across snow. About 15% of adults and 30–40% of juveniles die during hibernation.[3][page needed]
Feeding
edit
Their diet consists mainly of small mammals, such asmice,rats,voles,andshrews,as well aslizards.Sometimes, slow worms are taken, and evenweaselsandmoles.Adders also feed on amphibians, such asfrogs,newts,andsalamanders.Birds are also reported[31]to be consumed, especially nestlings and even eggs, for which they will climb into shrubbery and bushes. Generally, diet varies depending on locality.[19]
Juveniles will eat nestling mammals, small lizards and frogs as well as worms and spiders. One important dietary source for young adders is thealpine salamander(salamadra atra).[32]Because both species live at higher altitudes,S. atracould be a prevalent food source for adders, since there may be few other animals.[32]One study suggests that alpine salamanders could consist of almost half of the adders' diets in some locations.[32]They have been witnessed swallowing these salamanders in the early morning hours.[32]Once they reach about 30 cm (0.98 ft) in length, their diet begins to resemble that of the adults.[3][page needed]
Reproduction
editIn Hungary, mating takes place in the last week of April, whilst in the north it happens later (in the second week of May). Mating has also been observed in June and even early October, but it is not known if this autumn mating results in any offspring.[3][page needed]Females often breed once every two years,[19]or even once every three years if the seasons are short and the climate is not conducive.[3][page needed]
Males find females by following their scent trails, sometimes tracking them for hundreds of metres a day. If a female is found and then flees, the male follows. Courtship involves side-by-side parallel 'flowing' behaviour, tongue flicking along the back and excited lashing of the tail. Pairs stay together for one or two days after mating. Males chase away their rivals and engage in combat. Often, this also starts with the aforementioned flowing behaviour before culminating in the dramatic 'adder dance'.[3][page needed]In this act, the males confront each other, raise up the front part of the body vertically, make swaying movements and attempt to push each other to the ground. This is repeated until one of the two becomes exhausted and crawls off to find another mate. Appleby (1971) notes that he has never seen an intruder win one of these contests, as if the frustrated defender is so aroused by courtship that he refuses to lose his chance to mate.[33]There is no record of any biting taking place during these bouts.[19]
Females usually give birth in August or September, but sometimes as early as July, or as late as early October. Litters range in size from 3 to 20. The young are usually born encased in a transparent sac from which they must free themselves. Sometimes, they succeed in freeing themselves from this membrane while still inside the female.
Neonates measure 14 to 23 cm (5.5 to 9.1 in) in total length (including tail), with an average total length of 17 cm (6.7 in). They are born with a fully functional venom apparatus and a reserve supply of yolk within their bodies. They shed their skins for the first time within a day or two. Females do not appear to take much interest in their offspring, but the young have been observed to remain near their mothers for several days after birth.[19]
Venom
editBecause of the rapid rate of human expansion throughout the range of this species,bitesare relatively common. Domestic animals and livestock are frequent victims. In Great Britain, most instances occur in March–October. In Sweden, there are about 1,300 bites a year, with an estimated 12% that require hospitalisation.[3][page needed]At least eight differentantivenomsare available against bites from this species.[34]
Mallow et al. (2003) describe the venom toxicity as being relatively low compared to other viper species. They cite Minton (1974) who reported theLD50values for mice to be 0.55 mg/kgIV,0.80 mg/kgIPand 6.45 mg/kgSC.As a comparison, in one test the minimum lethal dose of venom for a guinea pig was 40–67 mg, but only 1.7 mg was necessary whenDaboia russeliivenom was used.[3][page needed]Brown (1973) gives a higher subcutaneous LD50range of 1.0–4.0 mg/kg.[14]All agree that the venom yield is low: Minton (1974) mentions 10–18 mg for specimens 48–62 cm (19–24.5 in) in length,[3][page needed]while Brown (1973) lists only 6 mg.[14] Relatively speaking, bites from this species are not highly dangerous.[3][page needed]InBritainthere were only 14 known fatalities between 1876 and 2005—the last a 5-year-old child in 1975[6]—and one nearly fatal bite of a 39-year-old woman in Essex in 1998.[6]An 82-year-old woman died following a bite in Germany in 2004, although it is not clear whether her death was due to the effect of the venom.[35]A 44-year-old British man was left seriously ill after he was bitten by an adder in theDalby Forest,Yorkshire, in 2014.[36]Even so, professional medical help should always be sought as soon as possible after any bite.[37]Very occasionally bites can be life-threatening, particularly in small children, while adults may experience discomfort and disability long after the bite.[6]The length of recovery varies, but may take up to a year.[3][page needed][38]
Local symptoms include immediate and intense pain, followed after a few minutes (but perhaps by as much as 30 minutes) by swelling and a tingling sensation. Blisters containing blood are not common. The pain may spread within a few hours, along with tenderness and inflammation. Reddishlymphangiticlines and bruising may appear, and the whole limb can become swollen and bruised within 24 hours. Swelling may also spread to the trunk, and with children, throughout the entire body.Necrosisandintracompartmental syndromesare very rare.[6]
Systemic symptoms resulting fromanaphylaxiscan be dramatic. These may appear within 5 minutes post bite, or can be delayed for many hours. Such symptoms include nausea, retching and vomiting, abdominalcolicand diarrhoea, incontinence of urine and faeces, sweating, fever,vasoconstriction,tachycardia,lightheadedness, loss of consciousness, blindness,[citation needed]shock,angioedemaof the face, lips, gums, tongue, throat andepiglottis,urticariaand bronchospasm. If left untreated, these symptoms may persist or fluctuate for up to 48 hours.[6]In severe cases, cardiovascular failure may occur.[3][page needed]
In culture and beliefs
editAdders were believed to be deaf, which is mentioned inPsalm 58(v. 4), butsnake oilmade from them was used as a cure for deafness and earache. Females were thought to swallow their young when threatened and regurgitate them unharmed later. It was believed that they did not die until sunset.[39]Remedies for adder "stings" included killing the snake responsible and rubbing the corpse or its fat on the wound, also holding a pigeon or chicken on the bite, or jumping over water. Adders were thought to be attracted tohazel treesand repelled byash trees.[5]
Druidsbelieved that large frenzied gatherings of adders occurred in spring, at the centre of which could be found a polished rock called anadder stoneorGlain Neidrin theWelsh language.These stones were said to have held supernatural powers.[5]
References
edit- ^abcMunkhbayar, K.; Rustamov, A; Orlov, N.L.; Jelić, D.; Meyer, A.; Borczyk, B.; Joger, U.; Tomović, L.; Cheylan, M.; Corti, C.; Crnobrnja-Isailović, J.; Vogrin, M.; Sá-Sousa, P.; Pleguezuelos, J.; Sterijovski, B.; Westerström, A.; Schmidt, B.; Sindaco, R.; Borkin, L.; Milto, K. & Nuridjanov, D. (2021)."Vipera berus".IUCN Red List of Threatened Species.2021:e.T47756146A743903.doi:10.2305/IUCN.UK.2021-3.RLTS.T47756146A743903.en.Retrieved8 August2023.
- ^abcMcDiarmid RW,Campbell JA,Touré TA(1999).Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1.Washington, District of Columbia: Herpetologists' League.ISBN1-893777-00-6(series).ISBN1-893777-01-4(volume).
- ^abcdefghijklmnopqrstuvMallow D,Ludwig D,Nilson G(2003).True Vipers: Natural History and Toxinology of Old World Vipers.Malabar, Florida: Krieger Publishing Company.ISBN0-89464-877-2.
- ^abStidworthy J(1974).Snakes of the World.New York: Grosset & Dunlap Inc. 160 pp.ISBN0-448-11856-4.
- ^abcd"Everyday Adders – the Adder in Folklore".The Herpetological Conservation Trust.Archived fromthe originalon 3 October 2009.Retrieved7 February2010.
- ^abcdefWarrell, David A. (2005)."Treatment of bites by adders and exotic venomous snakes".British Medical Journal.331(7527): 1244–1247.doi:10.1136/bmj.331.7527.1244.PMC1289323.PMID16308385.
- ^Gotch, Arthur Frederick (1986).Reptiles: Their Latin Names Explained.Poole, UK: Blandford Press. 176 pp.ISBN0-7137-1704-1.
- ^abc"Vipera berus".Integrated Taxonomic Information System.Retrieved15 August2006.
- ^abSteward JW(1971).The Snakes of Europe.Cranbury, New Jersey: Associated University Press (Fairleigh Dickinson University Press). 238 pp. LCCCN 77-163307.ISBN0-8386-1023-4.
- ^abMehrtens JM(1987).Living Snakes of the World in Color.New York: Sterling Publishers. 480 pp.ISBN0-8069-6460-X.
- ^"adder".Dictionary.com Unabridged.Random House, Inc.Retrieved7 February2010.
- ^U.S. Navy (1991).Poisonous Snakes of the World.New York: United States Government / Dover Publications Inc. 232 pp.ISBN0-486-26629-X.
- ^Vipera berusat theReptarium.cz Reptile Database.Accessed 21 November 2007.
- ^abcBrown, John H. (1973).Toxicology and Pharmacology of Venoms from Poisonous Snakes.Springfield, Illinois: Charles C. Thomas. 184 pp. LCCCN 73-229.ISBN0-398-02808-7.
- ^Olsson, M.;Madsen, T.;Shine, R.(1997)."Is sperm really so cheap? Costs of reproduction in male adders,Vipera berus".Proceedings of the Royal Society B: Biological Sciences.264(1380): 455–459.doi:10.1098/rspb.1997.0065.JSTOR50437.PMC1688262.(includes chart showing range of male mass in one population)
- ^Strugariu, Alexandru;Zamfirescu, Ştefan R.;Gherghel, Iulian(2009)."First record of the adder (Vipera berus berus) in Argeș County (Southern Romania) ".Biharean Biologist.3(2): 164. Archived fromthe originalon 23 October 2013.Retrieved9 February2013.(gives example masses of females).
- ^Krecsák, László; Wahlgren, Richard (2008). "A survey of the Linnaean type material ofColuber berus,Coluber cherseaandColuber prester(Serpentes, Viperidae) ".Journal of Natural History.42(35–36): 2343–2377.Bibcode:2008JNatH..42.2343K.doi:10.1080/00222930802126888.S2CID83947746.
- ^"Adder (Vipera berus) ".ARKive.Archived fromthe originalon 7 November 2008.Retrieved2 October2015.
- ^abcdefghStreet, Donald (1979).The Reptiles of Northern and Central Europe.London: B.T. Batsford Ltd. 272 pp.ISBN0-7134-1374-3.
- ^"Adder (Vipera berus) - facts and status ".ARKive.Archived fromthe originalon 11 July 2009.Retrieved7 February2010.This ref cites Beebee T, & Griffiths R. (2000)Amphibians and Reptiles: a Natural History of the British Herpetofauna.London: Harper Collins Publishers Ltd. as the source.
- ^"Hoggorm".WWF Norway(in Norwegian).
- ^"Hugorm".Ministry of Environment and Food of Denmark.Miljø- og Fødevareministeriet.Retrieved27 June2018.
- ^"9/2023 English - Translation of Finnish acts".Ympäristöministeriö (Ministry of the Environment). Chapter 8 Section 70.Retrieved2 June2024.
- ^"Artskyddsförordning (2007:845)".Klimat- och näringslivsdepartementet. 10 §.Retrieved12 June2024.
- ^Monney JC, Meyer A (2005).Rote Liste der gefährdeten Reptilien der Schweiz.Hrsg. Bundesamt für Umwelt, Wald und Landschaft BUWAL, Bern und Koordinationsstelle für Amphibien- und Reptilienschutz der Schweiz, Bern. BUWAL-Reihe.
- ^"Convention on the Conservation of European Wildlife and Natural Habitats, Appendix III".Council of Europe.19 September 1979.Retrieved6 September2021.
- ^"IV: The Categories".2001 IUCN Red List Categories and Criteria, version 3.1(PDF)(2nd ed.). International Union for Conservation of Nature. 2012.ISBN978-2-8317-1435-6.Retrieved14 February2010.
- ^Gardner, Emma; Julian, Angela; Monk, Chris; Baker, John (2019)."Make the Adder Count: population trends from a citizen science survey of UK adders"(PDF).Herpetological Journal.29:57–70.doi:10.33256/hj29.1.5770.S2CID92204234.
- ^Milton, Nicholas (1 October 2020)."Game birds 'could wipe out adders in most of Britain within 12 years'".The Guardian.ISSN0261-3077.Retrieved1 October2020.
- ^Boulenger, G.A.(1913).Snakes of Europe.London: Methuen & Co. pp. xi + 269 (Vipera berus,pp. 230–239, Figure 35).
- ^Leighton, Gerald R. (1901).The Life-History of British Serpents and Their Local Distribution in the British Isles.Edinburgh & London: Blackwood & Sons. p. 84.ISBN1-4446-3091-1.Retrieved8 February2010.
- ^abcdAnibaldi, Claudio;Luiselli, Luca;Capula, Massimo(1995). "The diet of juvenile adders, Vipera berus, in an alpine habitat".Amphibia-Reptilia.16(4): 404–407.doi:10.1163/156853895x00488.ISSN0173-5373.
- ^Appleby, Leonard G. (1971).British Snakes.London: J. Baker. 150 pp.ISBN0-212-98393-8.
- ^"Vipera berusantivenoms ".Munich AntiVenom INdex (MAVIN).Archived fromthe originalon 17 April 2019.Retrieved15 September2006.
- ^"Giftschlangen: Tod durch Kreuzotterbiss?"[Venomous snakes: death from adder bite?].Gemeinsames Giftinformationszentrum Erfurt(in German). 4 May 2004. Archived fromthe originalon 21 July 2011.Retrieved6 September2021.
- ^"Don't pick up snakes warn officials after man is bitten in Yorkshire forest".The Yorkshire Post.7 August 2014.Retrieved6 September2021.
- ^McKillop, Ann (April 2021)."Advice on Adder Bites".First Aid Training Co-operative.
- ^"Rekordmange bitt av hoggorm"[Record number of bites from vipers].Aftenposten(in Norwegian). 9 July 2018.Retrieved11 June2021.
- ^Simpson, Jacqueline; Roud, Stephen (2000)."Entry for" Adder "".A Dictionary of English Folklore.Oxford University Press.ISBN978-0192100191.
Further reading
edit- Ananjeva NB,Borkin LJ,Darevsky IS,Orlov NL(1998). [Amphibians and Reptiles. Encyclopedia of Nature of Russia]. Moscow: ABF. (in Russian).
- Arnold EN,Burton JA(1978).A Field Guide to the Reptiles and Amphibians of Britain and Europe.London: Collins. 272 pp.ISBN0-00-219318-3.(Vipera berus,pp. 217–218 + Plate 39 + Map 122).
- Boulenger GA(1896).Catalogue of the Snakes in the British Museum (Natural History). Volume III., Containing the...Viperidæ.London: Trustees of the British Museum (Natural History). (Taylor and Francis, printers). xiv + 727 pp. + Plates I.- XXV. (Vipera berus,pp. 476–481).
- Goin CJ,Goin OB,Zug GR(1978).Introduction to Herpetology: Third Edition.San Francisco: W.H. Freeman. xi + 378 pp.ISBN0-7167-0020-4.(Vipera berus,pp. 122, 188, 334).
- Jan G,Sordelli F(1874).Iconographie générale des Ophidiens: Quarante-cinquième Livraison.Paris: Baillière. Index + Plates I.- VI. (Vipera berus,Plate II, Figure 1; var.prester,Plate II, Figures 2-4; var.concolor,Plate II, Figure 5; var.lymnaea,Plate II, Figure 6).
- Joger U,Lenk P,Baran I,Böhme W,Ziegler T,Heidrich P,Wink M(1997). "The phylogenetic position ofVipera baraniand ofVipera nikolskiiwithin theVipera beruscomplex ".Herpetologica Bonnensis185-194.
- Linnaeus C(1758).Systema naturæ per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio Decima, Reformata.Stockholm: L. Salvius. 824 pp. (Coluber berus,p. 217).
- Minton SA Jr.(1974).Venom Diseases.Springfield, Illinois: CC Thomas Publ. 256 pp.ISBN978-0-398-03051-3.
- Morris PA(1948).Boy's Book of Snakes: How to Recognize and Understand Them.A volume of the Humanizing Science Series, edited byJacques Cattell.New York: Ronald Press. viii + 185 pp. (The common viper,Vipera berus,pp. 154–155, 182).
- Wüster, Wolfgang;Allum, Christopher S. E.; Bjargardóttir, I. Birta; Bailey, Kimberley L.; Dawson, Karen J.; Guenioui, Jamel; Lewis, John; McGurk, Joe; Moore, Alix G.; Niskanen, Martti; Pollard, Christopher P. (2004)."Do aposematism and Batesian mimicry require bright colours? A test, using European viper markings".Proceedings of the Royal Society of London. Series B: Biological Sciences.271(1556): 2495–2499.doi:10.1098/rspb.2004.2894.PMC1691880.PMID15590601.
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