Dwyer's snake (''Suta dwyeri'') also known commonly as the whip snake
"Balling as a defence mechanism for snakes", ''Journal of the Herpetological Society of Queensland'', Spring 2005 and the variable black-naped snake,
"''Suta dwyeri'' ". The Reptile Database. www.reptile-database.org. is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

venom Venom or zootoxin is a type of toxin produced by an animal that is actively delivered through a wound by means of a bite, sting, or similar action. The toxin is delivered through a specially evolved ''venom apparatus'', such as fangs or a sti ...

ous

snake Snakes are elongated, Limbless vertebrate, limbless, carnivore, carnivorous reptiles of the suborder Serpentes . Like all other Squamata, squamates, snakes are ectothermic, amniote vertebrates covered in overlapping Scale (zoology), scales. Ma ...

in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Elapidae Elapidae (, commonly known as elapids ; grc, ἔλλοψ ''éllops'' "sea-fish") is a family of snakes characterized by their permanently erect fangs at the front of the mouth. Most elapids are venomous, with the exception of the genus Emydoceph ...

. The species is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...

, where it is found from

New South Wales ) , nickname = , image_map = New South Wales in Australia.svg , map_caption = Location of New South Wales in AustraliaCoordinates: , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , es ...

to South Queensland.
Snake Tracks Species List While closely related to Australian

sea snakes Sea snakes, or coral reef snakes, are elapid snakes that inhabit marine environments for most or all of their lives. They belong to two subfamilies, Hydrophiinae and Laticaudinae. Hydrophiinae also includes Australasian terrestrial snakes, where ...

, ''S. dwyeri'' is a terrestrial

reptile Reptiles, as most commonly defined are the animals in the class Reptilia ( ), a paraphyletic grouping comprising all sauropsids except birds. Living reptiles comprise turtles, crocodilians, squamates (lizards and snakes) and rhynchocephalians ( ...

.
Elapid Land Snakes (Family Elapidae, Subfamily Elapinae): South-east Queensland

Etymology

The Specific name (zoology), specific name, ''dwyeri'', is in honor of

Australian Australian(s) may refer to: Australia * Australia, a country * Australians, citizens of the Commonwealth of Australia ** European Australians ** Anglo-Celtic Australians, Australians descended principally from British colonists ** Aboriginal Au ...

herpetologist Herpetology (from Greek ἑρπετόν ''herpetón'', meaning "reptile" or "creeping animal") is the branch of zoology concerned with the study of amphibians (including frogs, toads, salamanders, newts, and caecilians (gymnophiona)) and rept ...

John Dwyer John Dwyer may refer to: * John Dwyer (Australian judge) (1879–1966), Australian judge * John Dwyer (baseball) (active 1882), American baseball player * John Dwyer (field hockey) (born 1928), Australian Olympic hockey player * John Dwyer (medici ...

Taxonomy

There has been a great amount of instability of the nomenclature of many Australian snake

taxa In biology, a taxon (back-formation from ''taxonomy''; plural taxa) is a group of one or more populations of an organism or organisms seen by taxonomists to form a unit. Although neither is required, a taxon is usually known by a particular nam ...

, particularly concerning the generic classification of the smaller

, some of which have been placed in several different

genera Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ...

in the span of just a few decades. Accordingly, Dwyer's snake, which was originally named ''Denisonia dwyeri'' by Worrell in 1956, has been variously called ''Unechis dwyeri'' by Cogger in 1983, ''Suta dwyeri'' by Valentic in 1998, ''Suta spectabilis dwyeri'' by Cogger in 2000, and ''Parasuta dwyeri'' by Greer in 2006.

Description

Adult ''S. dwyeri'' males average 31 cm (12 inches) in length from the tip of the snout to the

uro Uro or URO may refer to: * Aurochs, the predecessor of modern cattle * Uro Bonsai technique; see deadwood bonsai techniques * Uro, Delta, Nigeria * ''Uro'' (film), directed by Stefan Faldbakken * Uro (trucks), a Spanish truck manufacturer * ''Ur ...

genital A sex organ (or reproductive organ) is any part of an animal or plant that is involved in sexual reproduction. The reproductive organs together constitute the reproductive system. In animals, the testis in the male, and the ovary in the female, a ...

vent. Females are slightly smaller at around 29 cm (11 inches) in snout-to-vent length (SVL).
Size and Breeding Information for Australian Snakes ''S. dwyeri'' has a cylindrical brown body with a slender to medium build. The head is short and somewhat widened so as to be distinct from the neck. The tail is short as well, and the

dorsal scales In snakes, the dorsal scales are the longitudinal series of plates that encircle the body, but do not include the ventral scales. Campbell JA, Lamar WW (2004). ''The Venomous Reptiles of the Western Hemisphere''. Ithaca and London: Comstock Publis ...

are smooth. The eye is medium-sized, with a vertically elliptical

pupil The pupil is a black hole located in the center of the iris of the eye that allows light to strike the retina.Cassin, B. and Solomon, S. (1990) ''Dictionary of Eye Terminology''. Gainesville, Florida: Triad Publishing Company. It appears black ...

.
Clinical Toxinology Resources

Reproduction

Animal husbandry, Breeders of exotic reptiles advise letting pairs of ''S. dwyeri'' mate when they reach a length of about for males and for females. This species is

viviparous Among animals, viviparity is development of the embryo inside the body of the parent. This is opposed to oviparity which is a reproductive mode in which females lay developing eggs that complete their development and hatch externally from the m ...

rather than egg laying and successfully births about three offspring per brood. Newborn ''S. dwyeri'' young are about long.

Defense mechanisms

Like other snakes in the

, ''S. dwyeri'' is

ous and has hollow

fang A fang is a long, pointed tooth. In mammals, a fang is a modified maxillary tooth, used for biting and tearing flesh. In snakes, it is a specialized tooth that is associated with a venom gland (see snake venom). Spiders also have external fang ...

s fixed at the front of the upper

jaw The jaw is any opposable articulated structure at the entrance of the mouth, typically used for grasping and manipulating food. The term ''jaws'' is also broadly applied to the whole of the structures constituting the vault of the mouth and serv ...

. These fangs are connected via ducts to venom

gland In animals, a gland is a group of cells in an animal's body that synthesizes substances (such as hormones) for release into the bloodstream (endocrine gland) or into cavities inside the body or its outer surface (exocrine gland). Structure De ...

s near the eyes. Like the majority of Australian elapids, Dwyer's snake is inoffensive and mostly harmless.

Herpetologist Herpetology (from Greek ἑρπετόν ''herpetón'', meaning "reptile" or "creeping animal") is the branch of zoology concerned with the study of amphibians (including frogs, toads, salamanders, newts, and caecilians (gymnophiona)) and rept ...

s at the

Queensland Museum The Queensland Museum is the state museum of Queensland, dedicated to natural history, cultural heritage, science and human achievement. The museum currently operates from its headquarters and general museum in South Brisbane with specialist mu ...

describe Dwyer's snake as "weakly venomous", and do not include it among their list of eight snake species in the

Brisbane Brisbane ( ) is the capital and most populous city of the states and territories of Australia, Australian state of Queensland, and the list of cities in Australia by population, third-most populous city in Australia and Oceania, with a populati ...

area considered capable of inflicting potentially fatal bites. A 25-year-old man in

Western Sydney Western may refer to: Places *Western, Nebraska, a village in the US *Western, New York, a town in the US *Western Creek, Tasmania, a locality in Australia *Western Junction, Tasmania, a locality in Australia *Western world, countries that id ...

mildly describes a

snakebite A snakebite is an injury caused by the bite of a snake, especially a venomous snake. A common sign of a bite from a venomous snake is the presence of two puncture wounds from the animal's fangs. Sometimes venom injection from the bite may occu ...

from this species by saying that he was:

... bitten on the finger by a ''Suta dwyeri'' once. The bite did not hurt at all. But little did I know he had left his fang in my finger. A couple of days later it got a tiny bit infected and hurt for a couple of days ... nothing major though.
Aussie Pythons & Snakes (aussiepythons.com)

When threatened ''P. dwyeri'' prefers to coil into a tight ball as a

defense mechanism In psychoanalytic theory, a defence mechanism (American English: defense mechanism), is an unconscious psychological operation that functions to protect a person from anxiety-producing thoughts and feelings related to internal conflicts and o ...

for protection from larger

predator Predation is a biological interaction where one organism, the predator, kills and eats another organism, its prey. It is one of a family of common feeding behaviours that includes parasitism and micropredation (which usually do not kill th ...

s. This enables the snake to protect its head and more vulnerable areas of its body.

Behaviour and habitat

''S. dwyeri'' is a secretive,

nocturnal Nocturnality is an animal behavior characterized by being active during the night and sleeping during the day. The common adjective is "nocturnal", versus diurnal meaning the opposite. Nocturnal creatures generally have highly developed sens ...

snake that seeks shelter under rocks, debris, and ground litter, and may make its home in

burrow An Eastern chipmunk at the entrance of its burrow A burrow is a hole or tunnel excavated into the ground by an animal to construct a space suitable for habitation or temporary refuge, or as a byproduct of locomotion. Burrows provide a form of sh ...

s made and abandoned by other creatures. Open

woodland A woodland () is, in the broad sense, land covered with trees, or in a narrow sense, synonymous with wood (or in the U.S., the ''plurale tantum'' woods), a low-density forest forming open habitats with plenty of sunlight and limited shade (see ...

grassland A grassland is an area where the vegetation is dominated by grasses (Poaceae). However, sedge (Cyperaceae) and rush (Juncaceae) can also be found along with variable proportions of legumes, like clover, and other herbs. Grasslands occur natur ...

, and rocky areas are its preferred natural

habitat In ecology, the term habitat summarises the array of resources, physical and biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species habitat can be seen as the physical ...

Diet

''S. dwyeri'' feeds mainly on small

lizard Lizards are a widespread group of squamate reptiles, with over 7,000 species, ranging across all continents except Antarctica, as well as most oceanic island chains. The group is paraphyletic since it excludes the snakes and Amphisbaenia alt ...

s such as

gecko Geckos are small, mostly carnivorous lizards that have a wide distribution, found on every continent except Antarctica. Belonging to the infraorder Gekkota, geckos are found in warm climates throughout the world. They range from . Geckos ar ...

s and

skink Skinks are lizards belonging to the family Scincidae, a family in the infraorder Scincomorpha. With more than 1,500 described species across 100 different taxonomic genera, the family Scincidae is one of the most diverse families of lizards. Ski ...

Images

Dwyer's snakeDwyer's snake