Golden hamster

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Golden hamster
Golden hamster front 1.jpg
A female pet hamster
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Cricetidae
Subfamily: Cricetinae
Genus: Mesocricetus
Species:
M. auratus
Binomial name
Mesocricetus auratus
Waterhouse, 1839
Synonyms

Cricetus auratus

The golden hamster or Syrian hamster (Mesocricetus auratus) is a rodent belonging to the hamster subfamily, Cricetinae. [2] Their natural geographical range is in an arid region of northern Syria and southern Turkey. Their numbers have been declining in the wild due to a loss of habitat from agriculture and deliberate elimination by humans. [1] Thus, wild golden hamsters are now considered endangered by the International Union for Conservation of Nature. [3] However, captive breeding programs are well established, and captive-bred golden hamsters are often kept as small house pets. They are also used as scientific research animals.

Contents

Syrian hamsters are larger than many of the dwarf hamsters kept as pocket pets (up to five times larger), though the wild European hamster exceeds Syrian hamsters in size.

Characteristics

Skull of a Golden hamster Mesocricetus auratus 02 MWNH 1067.jpg
Skull of a Golden hamster

Adult golden hamsters can reach around 7.1 in (18 cm) long. Females are usually larger than males, with a body mass of around 100–150 grams (3.5–5.3 oz) and lifespan of 1.5-2 years. Syrian hamsters from private breeders can be in the range of 175–225 grams (6.2–7.9 oz). [4]

Filling the cheek pouches with food Cheeks.JPG
Filling the cheek pouches with food

Like most members of the subfamily, the golden hamster has expandable cheek pouches, which extend from its cheeks to its shoulders. In the wild, hamsters are larder hoarders; they use their cheek pouches to transport food to their burrows. Their name in the local Arabic dialect where they were found roughly translates to "mister saddlebags" (Arabic: أبو جراب) due to the amount of storage space in their cheek pouches. [5]

Sexually mature female hamsters come into heat (estrus) every four days. Golden hamsters and other species in the genus Mesocricetus have the shortest gestation period in any known placental mammal at around 16 days. Gestation has been known to last up to 21 days, but this is rare and almost always results in complications. They can produce large litters of 20 or more young, although the average litter size is between eight and 10 pups. If a mother hamster is inexperienced or feels threatened, she may abandon or eat her pups. A female hamster enters estrus almost immediately after giving birth, and can become pregnant despite already having a litter. This act puts stress on the mother's body and often results in very weak and undernourished young.[ citation needed ]

Discovery

Golden hamsters originate from Syria and were first described by scientists in the 1797 second edition of The Natural History of Aleppo , a book written and edited by two Scottish physicians living in Syria. [6] The Syrian hamster was then recognized as a distinct species in 1839 by British zoologist George Robert Waterhouse, who named it Cricetus auratus or the "golden hamster". The skin of the holotype specimen is kept at the Natural History Museum in London. [7]

A yellow-colored golden hamster Peach the pet hamster.jpg
A yellow-colored golden hamster

In 1930, Israel Aharoni, a zoologist and professor at the Hebrew University of Jerusalem, captured a mother hamster and her litter of pups in Aleppo, Syria. The hamsters were bred in Jerusalem as laboratory animals.

Descendants of the captive hamsters were shipped to Britain in 1931, where they came under the care of the Wellcome Bureau of Scientific Research. These bred and two more pairs were given to the Zoological Society of London in 1932. The descendants of these were passed on to private breeders in 1937.

In 1946, Albert Marsh began the first commercial hamster breeding business, Gulf Hamstery, to promote the Syrian hamster as pets and laboratory animals. [8]

A separate stock of hamsters was exported from Syria to the United States in 1971, but mitochondrial DNA studies have established that all domestic golden hamsters are descended from one female – likely the one captured in 1930 in Syria. [9]

Since the species was named, the genus Cricetus has been subdivided and this species (together with several others) was separated into the genus Mesocricetus, leading to the currently accepted scientific name for the golden hamster of Mesocricetus auratus. [10]

Behavior

A long-haired male golden hamster Syrian hamster.jpg
A long-haired male golden hamster

A solitary species, Syrian hamsters are very territorial and intolerant of each other; attacks against each other are commonplace. Exceptions do occur, usually when a female and male meet when the female is in heat, but even so, the female may attack the male after mating. In captivity, babies are separated from their mother and by sex after four weeks, as they sexually mature at four to five weeks old. Same-sex groups of siblings can stay with each other until they are about eight weeks old, at which point they will become territorial and fight with one another, sometimes to the death. Infanticide is not uncommon among female golden hamsters. In captivity, they may kill and eat healthy young as a result of the pups interacting with humans, as any foreign scent is treated as a threat. Females also eat their dead young in the wild. [11]

Golden hamsters mark their burrows with secretions from special scent glands on their hips called flank glands. Male hamsters in particular lick their bodies near the glands, creating damp spots on the fur, then drag their sides along objects to mark their territory. Females also use bodily secretions and feces.

Survival in the wild

Following Professor Aharoni's collection in 1930, only infrequent sightings and captures were reported in the wild. Finally, to confirm the current existence of the wild golden hamster in northern Syria and southern Turkey, two expeditions were carried out in September 1997 and March 1999. The researchers found and mapped 30 burrows. None of the inhabited burrows contained more than one adult. The team caught six females and seven males. One female was pregnant and gave birth to six pups. All these 19 caught golden hamsters, together with three wild individuals from the University of Aleppo, were shipped to Germany to form a new breeding stock. [12]

Observations of females in this wild population have revealed, contrary to laboratory populations, that activity patterns are crepuscular rather than nocturnal, possibly to avoid nocturnal predators such as owls. [13]

As research animals

Golden hamsters are used to model human medical conditions including various cancers, metabolic diseases, non-cancer respiratory diseases, cardiovascular diseases, infectious diseases, and general health concerns. [14] In 2006 and 2007, golden hamsters accounted for 19% of the total Animal Welfare Act-covered animal research subjects in the United States. [15]

Video showing the gait of a lab-bred hamster from the underside

As pets

A golden hamster listening from its plastic exercise wheel Syrian Hamster 2.JPG
A golden hamster listening from its plastic exercise wheel

Golden hamsters are popular as house pets due to their docile, inquisitive nature, cuteness, and small size. However, these animals have some special requirements that must be met for them to be healthy. Although some people think of them as a pet for young children, the American Society for the Prevention of Cruelty to Animals recommends hamsters as pets only for people over age 6 and the child should be supervised by an adult. [16] Cages should be a suitable size, safe, comfortable, and interesting. If a hamster is constantly chewing or climbing on the bars of its cage, then it needs more stimulation or a larger cage. The minimum recommended size for a hamster cage is 775 square inches (5,000 cm2), of continuous floor space[ citation needed ]. These can be made by cutting and connecting large plastic storage bins, or a large glass aquarium. Appropriately sized wooden cages can be made, or bought online. The majority of hamster cages sold in pet stores do not meet these size requirements. Hamster Society Singapore (HHS) recommends a minimum of 4,000 square centimetres (620 sq in) for Syrian hamsters, [17] while Tierärztliche Vereinigung für Tierschutz (TVT) recommends giving them as much space as you can and at minimum 100 cm × 50 cm × 50 cm (L × W × H) which is 5,000 cm2 (780 sq in). [18]

This image shows a Syrian hamster burrowed in his bedding. Burrowing Hamster.jpg
This image shows a Syrian hamster burrowed in his bedding.

A hamster wheel is a common type of environmental enrichment, and it is important that hamsters have a wheel in their cage. TVT recommends wheels should be at least 30 cm for Syrian hamsters, since smaller diameters lead to permanent spinal curvatures, especially in young animals. They also recommend a solid running surface because rungs or mesh can cause injury, or bumblefoot. [19] A hamster should be able to run on its wheel without arching its back. A hamster that has to run with an arched back can have back pain and spine problems. A variety of toys and cardboard tubes and boxes can help to provide enrichment, as they are energetic and need space to exercise. [20]

Most hamsters in American and British pet stores are Syrian hamsters. Originally, Syrian hamsters occurred in just one color – the natural wild agouti - but they have since developed a variety of color and pattern mutations, including cream, white, blonde, cinnamon, tortoiseshell, black, three different shades of gray, dominant spot, banded, and dilute. Selective breeding has also produced a variety of coat types such as long-haired, satin, and rex.[ citation needed ]

Breeding

Syrian hamster mating Syrian hamster - mating.jpg
Syrian hamster mating

The practice of selective breeding of golden hamsters requires an understanding of their care, knowledge about breed variations, a plan for selective breeding, scheduling of the female body cycle, and the ability to manage a colony of hamsters.

A hamster mother emerging from a tube to see her two young, which are less than a week old Hamster with babies.jpg
A hamster mother emerging from a tube to see her two young, which are less than a week old

Breed variations

Often long-haired hamsters are referred to by their nickname "teddy bear". They are identical to short-haired Syrians except for the hair length and can be found in any color, pattern, or other coat type available in the species. Male long-haired hamsters usually have longer fur than the female, culminating in a "skirt" of longer fur around their backsides. Long-haired females have a much shorter coat although it is still significantly longer than that of a short-haired female.

See also

Related Research Articles

<span class="mw-page-title-main">Hamster</span> Subfamily of rodents (Cricetinae)

Hamsters are rodents belonging to the subfamily Cricetinae, which contains 19 species classified in seven genera. They have become established as popular small pets. The best-known species of hamster is the golden or Syrian hamster, which is the type most commonly kept as a pet. Other hamster species commonly kept as pets are the three species of dwarf hamster, Campbell's dwarf hamster, the winter white dwarf hamster and the Roborovski hamster.

<span class="mw-page-title-main">Mouse</span> Small long-tailed rodent

A mouse is a small rodent. Characteristically, mice are known to have a pointed snout, small rounded ears, a body-length scaly tail, and a high breeding rate. The best known mouse species is the common house mouse. Mice are also popular as pets. In some places, certain kinds of field mice are locally common. They are known to invade homes for food and shelter.

<span class="mw-page-title-main">Common degu</span> Species of rodent (Octodon degus)

The common degu, or, historically, the degu, is a small hystricomorpha rodent endemic to the Chilean matorral ecoregion of central Chile. The name degu on its own indicates either the entire genus Octodon or, more commonly, just the common degu. Common degus belong to the parvorder Caviomorpha of the infraorder Hystricognathi, along with the chinchilla and guinea pig. The word degu comes from the indigenous language of Chile, Mapudungun, and the word dewü, meaning 'mouse' or 'rat'.

<span class="mw-page-title-main">Mongolian gerbil</span> Species of mammal

The Mongolian gerbil or Mongolian jird is a rodent belonging to the subfamily Gerbillinae. Their body size is typically 110–135 mm, with a 95–120 mm tail, and body weight 60–130 g, with adult males larger than females. The animal is used in science and research or kept as a small house pet. Their use in science dates back to the latter half of the 19th century, but they only started to be kept as pets in the English-speaking world after 1954, when they were brought to the United States. However, their use in scientific research has fallen out of favor.

<span class="mw-page-title-main">Turkish hamster</span> Species of mammal

The Turkish hamster, also referred to as Brandt's hamster, Azerbaijani hamster, or avurtlak, is a species of hamster native to Turkey, Azerbaijan and other surrounding nations. The Turkish hamster, first catalogued in 1878, is a fairly close relative of the Syrian or golden hamster, though far less is known about it, and it is rarely kept as a pet. The population of the Turkish hamster is said to be declining in the wild, yet this hamster is often used in laboratory testing. Turkish hamsters have lifespans of about two years and are solitary, nocturnal animals, which practice hibernation. They are reported to be more aggressive than other members of the family Cricetidae. They are tan and dark, sandy brown in color. Like all hamsters, the Turkish hamster has cheek pouches that allow it to carry large amounts of food at one time.

<span class="mw-page-title-main">Winter white dwarf hamster</span> Species of hamster kept as pets

The winter white dwarf hamster, also known as the Russian dwarf hamster, Djungarian hamster, Dzungarian hamster, striped dwarf hamster, Siberian hamster, or Siberian dwarf hamster, is one of three species of hamster in the genus Phodopus. It is ball-shaped and typically half the size of the Syrian hamster, so is called a dwarf hamster along with all Phodopus species. Features of the winter white hamster include a typically thick, dark grey dorsal stripe and furry feet. As winter approaches and the days shorten, the winter white dwarf hamster's dark fur is almost entirely replaced with white fur. In captivity, this does not usually happen as animals maintained as pets are generally housed indoors and exposed to artificial light that prevents the recognition of short winter daylengths. In the wild, they originate from the wheat fields of Kazakhstan, the meadows of Mongolia and Siberia, and the birch stands of Manchuria.

<span class="mw-page-title-main">Campbell's dwarf hamster</span> Species of hamster

Campbell's dwarf hamster is a species of hamster in the genus Phodopus. It was given its common name by Oldfield Thomas in honor of Charles William Campbell, who collected the first specimen in Mongolia on July 1, 1902. It is distinguished from the closely related Djungarian hamster as it has smaller ears and no dark fur on its crown. Campbell's dwarf hamster typically has a narrow dorsal stripe compared to the Djungarian hamster and grey fur on the stomach. This hamster may be raised in captivity and kept as a small pet.

<span class="mw-page-title-main">Rodents as pets</span> Small pet mammal, possibly exotic

The most common rodents kept as household pets are hamsters, gerbils, common degus, fancy mice, fancy rats, common chinchillas, and guinea pigs (cavies).

<span class="mw-page-title-main">Fancy mouse</span> Mouse that has been selectively bred for exhibition

A fancy mouse is a domesticated form of the house mouse, one of many species of mice, usually kept as a type of pocket pet. Fancy mice have also been specially bred for exhibiting, with shows being held internationally. A pet mouse is inexpensive compared to larger pets, and even many other pet rodents, but mice are comparatively short-lived: typically only 2 to 3 years.

<span class="mw-page-title-main">Roborovski dwarf hamster</span> Species of rodent

The Roborovski hamster, also known as the desert hamster, Robo dwarf hamster or simply dwarf hamster is the smallest of three species of hamster in the genus Phodopus. It lives in the deserts of Central Asia, averaging 2 centimetres (0.8 in) at birth and 5 centimetres (2.0 in) and 20–25 grams (0.71–0.88 oz) during adulthood. Distinguishing characteristics of the Roborovskis are eyebrow-like white spots and the lack of any dorsal stripe. The average lifespan for the Roborovski hamster is 2–4 years, though this is dependent on living conditions. Roborovskis are known for their speed and have been said to run up to 6 miles a night.

<span class="mw-page-title-main">Hamster wheel</span> Toy used by rodents such as hamsters, gerbils or mice to exercise in confined spaces such as a cage

A hamster wheel or running wheel is an exercise device used primarily by hamsters and other rodents, but also by other cursorial animals when given the opportunity. Most of these devices consist of a runged or ridged wheel held on a stand by a single or pair of stub axles. Hamster wheels allow rodents to run even when their space is confined. The earliest dated use of the term "hamster wheel", located by the Oxford English Dictionary, is in a 1949 newspaper advertisement.

<i>Mesocricetus</i> Genus of Old World hamsters

Mesocricetus is a genus of Old World hamsters, including the Syrian or golden hamster, the first hamster to be introduced as a domestic pet, and still the most popular species of hamster for that purpose.

<span class="mw-page-title-main">European hamster</span> Species of hamster native to Eurasia

The European hamster, also known as the Eurasian hamster, black-bellied hamster or common hamster, is the only species of hamster in the genus Cricetus. It is native to grassland and similar habitats in a large part of Eurasia, extending from Belgium to the Altai Mountains and Yenisey River in Russia. Historically, it was considered a farmland pest and had been trapped for its fur. Its population has declined drastically in recent years and is now considered critically endangered. The main threats to the species are thought to be intensive agriculture, habitat destruction, and persecution by farmers.

The Ciscaucasian hamster is a species of rodent in the family Cricetidae. It is also known as the Georgian hamster and is found only in Georgia and Russia.

<span class="mw-page-title-main">Hamster ball</span> Exercise toy for pet hamster

Hamster balls are hollow spheres made of clear plastic into which hamsters, gerbils, degus and other small rodent pets are placed, allowing them to run around outside their cages without the risk of running away or getting lost under furniture. They are designed to provide hamsters with exercise. Balls produce an audible rumble across most surfaces, making them easier to locate even when out of sight.

Colours of the Syrian hamster can be described in three ways: as "self", "agouti" or "combinations". Self colours are a consistent coat colour with the same colour topcoat and undercoat. Agouti hamsters have a ticked coat, where each individual fur is banded in different colours. Agouti hamsters also have "agouti markings" which consist of dark cheek markings, a dark marking on the head, and a light underbelly. Combinations are produced when two self or agouti colours are present.

<span class="mw-page-title-main">Hamster show</span> Event where hamsters are competitively shown

A hamster show is an event in which people gather hamsters to judge them against each other. Hamster shows are also places where people share their enthusiasm for hamsters among attendees. Hamster shows feature an exhibition of the hamsters participating in the judging.

<span class="mw-page-title-main">Hamster cage</span> Enclosure that houses hamsters

A hamster cage is an enclosure designed to house one hamster. It is recommended that hamster cages are at least 5000cm² for dwarf hamster except Roborovski and 6000cm² for syrian and Roborovski, although there is evidence that hamsters experience less stress if housed in larger cages. Commercially available pens are made of wire or plastic - both of which are unsafe for hamsters. Some pet owners house their hamsters in aquarium tanks, and some make their own pens out of wood or safe materials like plexi. Laboratory hamsters, commonly known as laboratory Syrian hamsters, are housed in pens designed for scientific use. There are also special pens designed for hamster shows.

<span class="mw-page-title-main">Domestication of the Syrian hamster</span>

The domestication of the Syrian hamster began in the late 1700s when naturalists cataloged the Syrian hamster, also known as Mesocricetus auratus or the golden hamster. In 1930 medical researchers captured Syrian hamster breeding stock for animal testing. Further domestication led this animal to become a popular pet.

Syrian hamster behavior refers to the ethology of the Syrian hamster.

References

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  12. Gattermann, R.; Fritzsche, P.; Neumann, K.; Al-Hussein, I.; Kayser, A.; Abiad, M.; Yakti, R. (2001). "Notes on the current distribution and the ecology of wild golden hamsters (Mesocricetus auratus)". Journal of Zoology. 254 (3). Cambridge University Press: 359–365. doi:10.1017/S0952836901000851.
  13. Gattermann, R.; Johnston, R. E.; Yigit, N; Fritzsche, P; Larimer, S; Ozkurt, S; Neumann, K; Song, Z; et al. (2008). "Syrian hamsters are nocturnal in captivity but diurnal in nature". Biology Letters. 4 (3): 253–255. doi:10.1098/rsbl.2008.0066. PMC   2610053 . PMID   18397863.
  14. Valentine et al. 2012, p. 875-898.
  15. United States Department of Agriculture (September 2008), Animal Care Annual Report of Activities – Fiscal Year 2007 (PDF), United States Department of Agriculture, retrieved 14 January 2016
  16. "Hamster Care" (PDF). American Society for the Prevention of Cruelty to Animals. 2010.
  17. Hamster Society Singapore
  18. Tierärztliche Vereinigung für Tierschutz e.V., Merkblatt Nr. 156 – Heimtiere: Goldhamster (Stand: 2014), pets: golden hamster, Housing
  19. Tierärztliche Vereinigung für Tierschutz e.V., Merkblatt Nr. 62 – Heimtierhaltung, Tierschutzwidriges Zubehör (Stand: Jan. 2010), II. Anti-animal welfare accessories for small mammals, 7. Wheels
  20. Alderton, David (2002). Hamster . Collins. ISBN   978-0-00-712282-0.[ page needed ]

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