Ecology

Associations

Known predators

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Known prey organisms

Leporidae (rabbit carcass) preys on:
Pryola
Corylus
Cornus
Aralia
Salix longifolia
Salix petiolaris
leaves
wood
bark
roots
Stipagrostis
Monsonia
Eragrostis
Eleucine
Cyperus
Cenchrus
Zizyphus
Crotalaria

Based on studies in:
Canada: Manitoba (Forest)
New Zealand (Grassland)
USA: Illinois (Forest)
Namibia, Namib Desert (Desert or dune)
India, Rajasthan Desert (Desert or dune)

This list may not be complete but is based on published studies.
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Evolution and Systematics

Functional Adaptations

Functional adaptation

Self-medicating prevents disease: rabbits
 

The ears of rabbits assist in Vitamin D acquisition because they have an oil on the surface that transforms to Vitamin D in sunlight, which is then ingested as the rabbits clean themselves.

   
  "Even rabbits have a therapeutic trick or two - in their case, behind the ears. Mammals need vitamin D - which works with calcium to make healthy bones - in order to prevent such problems as fractures, as well as to keep diseases such as rickets at bay. It is well known that in mammals this vitamin is synthesized when the skin is exposed to sunlight. As noted by John Downer in SuperNatural (1999), rabbits put this principle to good medicinal use when they wash behind their ears with their paws. The oil on the outer surface of the rabbits' extra-long ears contains a chemical that transforms into vitamin D when there is enough sunlight. And when rabbits lick their paws after washing behind their ears, they transfer this vitamin supply to their mouths and, therefore, into their digestive system." (Shuker 2001:218)
  Learn more about this functional adaptation.
  • Shuker, KPN. 2001. The Hidden Powers of Animals: Uncovering the Secrets of Nature. London: Marshall Editions Ltd. 240 p.
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Molecular Biology and Genetics

Barcode

Locations of barcode samples

Collection Sites: world map showing specimen collection locations for Leporidae
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Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                                             
Specimen Records:297
Specimens with Sequences:214
Specimens with Barcodes:213
Public Records:8
Species:16
Species With Barcodes:15
  
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Barcode data

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Wikipedia

Rabbit

Rabbits are small mammals in the family Leporidae of the order Lagomorpha, found in several parts of the world. There are eight different genera in the family classified as rabbits, including the European rabbit (Oryctolagus cuniculus), cottontail rabbits (genus Sylvilagus; 13 species), and the Amami rabbit (Pentalagus furnessi, an endangered species on Amami Ōshima, Japan). There are many other species of rabbit, and these, along with pikas and hares, make up the order Lagomorpha. The male is called a buck and the female is a doe; a young rabbit is a kitten or kit.

Contents

Habitat and range

Outdoor entrance to a rabbit burrow
Outdoor entrance to a rabbit burrow

Rabbit habitats include meadows, woods, forests, grasslands, deserts and wetlands.[1] Rabbits live in groups, and the best known species, the European rabbit, lives in underground burrows, or rabbit holes. A group of burrows is called a warren.[1]

More than half the world's rabbit population resides in North America.[1] They are also native to southwestern Europe, Southeast Asia, Sumatra, some islands of Japan, and in parts of Africa and South America. They are not naturally found in most of Eurasia, where a number of species of hares are present. Rabbits first entered South America relatively recently, as part of the Great American Interchange. Much of the continent has just one species of rabbit, the tapeti, while most of South America's southern cone is without rabbits.

The European rabbit has been introduced to many places around the world.[2]

Morphology and ecology

The rabbit's long ears, which can be more than 10 cm (4 in) long, are probably an adaptation for detecting predators. They have large, powerful hind legs. The two front paws have 5 toes, the extra called the dewclaw. The hind feet have 4 toes.[3] They are plantigrade animals while at rest; however, they move around on their toes while running, assuming a more digitigrade form. Wild rabbits do not differ much in their body proportions or stance, with full, egg-shaped bodies. Their size can range anywhere from 20 cm (8 in) in length and 0.4 kg in weight to 50 cm (20 in) and more than 2 kg. The fur is most commonly long and soft, with colors such as shades of brown, gray, and buff. The tail is a little plume of brownish fur (white on top for cottontails).[2]

Because the rabbit's epiglottis is engaged over the soft palate except when swallowing, the rabbit is an obligate nasal breather. Rabbits have two sets of incisor teeth, one behind the other. This way they can be distinguished from rodents, with which they are often confused.[4] Carl Linnaeus originally grouped rabbits and rodents under the class Glires; later, they were separated as the predominant opinion was that many of their similarities were a result of convergent evolution. However, recent DNA analysis and the discovery of a common ancestor has supported the view that they share a common lineage, and thus rabbits and rodents are now often referred to together as members of the superclass Glires.[5]

Rabbits are hindgut digesters. This means that most of their digestion takes place in their large intestine and cecum. In rabbits the cecum is about 10 times bigger than the stomach and it along with the large intestine makes up roughly 40% of the rabbit's digestive tract.[6] The unique musculature of the cecum allows the intestinal tract of the rabbit to separate fibrous material from more digestible material; the fibrous material is passed as feces, while the more nutritious material is encased in a mucous lining as a cecotrope. Cecotropes, sometimes called "night feces", are high in minerals, vitamins and proteins that are necessary to the rabbit's health. Rabbits eat these to meet their nutritional requirements; the mucous coating allows the nutrients to pass through the acidic stomach for digestion in the intestines. This process allows rabbits to extract the necessary nutrients from their food.[7]

Rabbits are prey animals and are therefore constantly aware of their surroundings. For instances, in Mediterranean Europe, rabbits are the main prey of red foxes, badgers, and Iberian lynxes.[8] If confronted by a potential threat, a rabbit may freeze and observe then warn others in the warren with powerful thumps on the ground. Rabbits have a remarkably wide field of vision, and a good deal of it is devoted to overhead scanning.[9] They survive predation by burrowing, hopping away in a zig- zag motion, and, if captured, delivering powerful kicks with their hind legs. Their strong teeth allow them to eat and to bite in order to escape a struggle.[10]

Sleep

The average sleep time of a captive rabbit is said to be 8.4 hours.[11]

Reproduction

A litter of rabbit kits (baby rabbits)
A nest containing baby rabbits

Rabbits have a very rapid reproductive rate. The breeding season for most rabbits lasts 9 months, from February to October. In Australia and New Zealand breeding season is late July to late January. Normal gestation is about 30 days. The average size of the litter varies but is usually between 4 and 12 babies, with larger breeds having larger litters. A kit (baby rabbit) can be weaned at about 4 to 5 weeks of age. This means in one season a single female rabbit can produce as many as 800 children, grandchildren, and great-grandchildren. A doe is ready to breed at about 6 months of age, and a buck at about 7 months. Courtship and mating are very brief, lasting only 30 to 40 seconds. Courtship behavior involves licking, sniffing, and following the doe. Spraying urine is also a common sexual behavior. Female rabbits are reflex ovulators. The female rabbit also may or may not lose clumps of hair during the gestation period.

Ovulation begins 10 hours after mating. After mating, the female makes a nest or burrow, and lines the nest with fur from the dewlap, flanks, and belly. This behavior also exposes the nipples enabling her to better nurse the kits. Kits are altricial, which means they are born blind, naked, and helpless. Passive immunity (immunity acquired by transfer of antibodies or sensitized lymphocytes from another animal) is acquired by kits prior to birth via placental transfer.

Due to the nutritious nature of rabbit milk kits only need to be nursed for a few minutes once or twice a day.[12] At 10 to 11 days after birth the baby rabbits' eyes open and they start eating on their own at around 14 days old. Although born naked, they form a soft baby coat of hair within a few days. At the age of 5 to 6 weeks the soft baby coat is replaced with a pre-adult coat. At about 6 to 8 months of age this intermediate coat is replaced by the final adult coat, which is shed twice a year thereafter.

The expected rabbit lifespan is about 9–12 years;[13][14] the world's longest-lived was 18 years.[15]

Diet and eating habits

Rabbits are herbivores that feed by grazing on grass, forbs, and leafy weeds. In consequence, their diet contains large amounts of cellulose, which is hard to digest. Rabbits solve this problem by passing two distinct types of feces: hard droppings and soft black viscous pellets, the latter of which are immediately eaten. Rabbits reingest their own droppings (rather than chewing the cud as do cows and many other herbivores) to digest their food further and extract sufficient nutrients.[16]

Rabbits graze heavily and rapidly for roughly the first half hour of a grazing period (usually in the late afternoon), followed by about half an hour of more selective feeding. In this time, the rabbit will also excrete many hard fecal pellets, being waste pellets that will not be reingested. If the environment is relatively non-threatening, the rabbit will remain outdoors for many hours, grazing at intervals. While out of the burrow, the rabbit will occasionally reingest its soft, partially digested pellets; this is rarely observed, since the pellets are reingested as they are produced. Reingestion is most common within the burrow between 8 o'clock in the morning and 5 o'clock in the evening, being carried out intermittently within that period.

Hard pellets are made up of hay-like fragments of plant cuticle and stalk, being the final waste product after redigestion of soft pellets. These are only released outside the burrow and are not reingested. Soft pellets are usually produced several hours after grazing, after the hard pellets have all been excreted. They are made up of micro-organisms and undigested plant cell walls.

The chewed plant material collects in the large cecum, a secondary chamber between the large and small intestine containing large quantities of symbiotic bacteria that help with the digestion of cellulose and also produce certain B vitamins. The pellets are about 56% bacteria by dry weight, largely accounting for the pellets being 24.4% protein on average. These pellets remain intact for up to six hours in the stomach; the bacteria within continue to digest the plant carbohydrates. The soft feces form here and contain up to five times the vitamins of hard feces. After being excreted, they are eaten whole by the rabbit and redigested in a special part of the stomach. This double-digestion process enables rabbits to use nutrients that they may have missed during the first passage through the gut, as well as the nutrients formed by the microbial activity and thus ensures that maximum nutrition is derived from the food they eat.[2] This process serves the same purpose within the rabbit as rumination does in cattle and sheep.[17]

Rabbits are incapable of vomiting.[18]

Rabbit diseases

Some rabbits may have rabies.

Differences from hares

The most obvious difference between rabbits and hares is how their kits are born. Rabbits are altricial, having young that are born blind and hairless. In contrast, hares are born with hair and are able to see (precocial). All rabbits except cottontail rabbits live underground in burrows or warrens, while hares live in simple nests above the ground (as do cottontail rabbits), and usually do not live in groups. Hares are generally larger than rabbits, with longer ears, larger and longer hind legs and have black markings on their fur. Hares have not been domesticated, while European rabbits are both raised for meat and kept as pets.

As pets

Domestic rabbits can be kept as pets in a back yard hutch or indoors in a cage or house trained to have free roam. Rabbits kept indoors are often referred to as house rabbits. House rabbits typically have an indoor pen or cage and a rabbit-safe place to run and exercise, such as an exercise pen, living room or family room. Rabbits can be trained to use a litter box and some can learn to come when called. Domestic rabbits that do not live indoors can also serve as companions for their owners, typically living in a protected hutch outdoors. Some pet rabbits live in outside hutches during the day for the benefit of fresh air and natural daylight and are brought inside at night.

Whether indoor or outdoor, pet rabbits' pens are often equipped with enrichment activities such as shelves, tunnels, balls, and other toys. Pet rabbits are often provided additional space in which to get exercise, simulating the open space a rabbit would traverse in the wild. Exercise pens or lawn pens are often used to provide a safe place for rabbits to run.

A pet rabbit's diet typically consists of unlimited timothy-grass or other hay, a small amount of pellets, and a fair quantity of fresh vegetables and need unrestricted access to fresh clean water. Rabbits are social animals. Rabbits as pets can find their companionship with a variety of creatures, including humans, other rabbits, birds, chinchillas, guinea pigs, and sometimes even cats and dogs (however they require supervision when with dogs and cats, as they might be preyed upon or attacked by these animals). Rabbits can make good pets for younger children when proper parental supervision is provided. As prey animals, rabbits are alert, timid creatures that startle fairly easily. They have fragile bones, especially in their backs, that require support on the belly and bottom when picked up. Older children and teenagers usually have the maturity required to care for a rabbit.[19]

As food and clothing

Rabbit meat sold commercially
Tanned rabbit pelt; rabbit pelt is prized for its softness.
An Australian 'Rabbiter' circa 1900
An old wooden cart, piled with rabbit skins, in New South Wales, Australia

Leporids such as European rabbits and hares are a food meat in Europe, South America, North America, some parts of the Middle East.

Rabbit is still sold in UK butchers and markets, and some supermarkets sell frozen rabbit meat. Additionally, some have begun selling fresh rabbit meat alongside other types of game. At farmers markets and the famous Borough Market in London, rabbits will be displayed dead and hanging unbutchered in the traditional style next to braces of pheasant and other small game. Rabbit meat was once commonly sold in Sydney, Australia, the sellers of which giving the name to the rugby league team the South Sydney Rabbitohs, but quickly became unpopular after the disease myxomatosis was introduced in an attempt to wipe out the feral rabbit population (see also Rabbits in Australia). Rabbit meat is also commonly used in Moroccan cuisine, where it is cooked in a tajine with "raisins and grilled almonds added a few minutes before serving".[20]. Rabbit meat is unpopular in the Asia-Pacific.

When used for food, rabbits are both hunted and bred for meat. Snares or guns are usually employed when catching wild rabbits for food. In many regions, rabbits are also bred for meat, a practice called cuniculture. Rabbits can then be killed by hitting the back of their heads, a practice from which the term rabbit punch is derived. Rabbit meat is a source of high quality protein.[21] It can be used in most ways chicken meat is used. In fact, well-known chef Mark Bittman says that domesticated rabbit tastes like chicken because both are blank palettes upon which any desired flavors can be layered.[22] Rabbit meat is leaner than beef, pork, and chicken meat. Rabbit products are generally labeled in three ways, the first being Fryer. This is a young rabbit between 4.5 and 5 pounds and up to 9 weeks in age.[23] This type of meat is tender and fine grained. The next product is a Roaster; they are usually over 5 pounds and up to 8 months in age. The flesh is firm and coarse grained and less tender than a fryer. Then there are giblets which include the liver and heart. One of the most common types of rabbit to be bred for meat is New Zealand white rabbit.

There are several health issues associated with the use of rabbits for meat, one of which is tularemia or rabbit fever.[24] Another is so-called rabbit starvation, due most likely to deficiency of essential fatty acids in rabbit meat. Rabbits are a common food item of large pythons, such as Burmese pythons and reticulated pythons, both in the wild and in captivity.

Rabbit pelts are sometimes used for clothing and accessories, such as scarves or hats. Angora rabbits are bred for their long, fine hair, which can be sheared and harvested like sheep wool. Rabbits are very good producers of manure; additionally, their urine, being high in nitrogen, makes lemon trees very productive. Their milk may also be of great medicinal or nutritional benefit due to its high protein content.[25]

Environmental problems

Rabbits have been a source of environmental problems when introduced into the wild by humans. As a result of their appetites, and the rate at which they breed, feral rabbit depredation can be problematic for agriculture. Gassing, barriers (fences), shooting, snaring, and ferreting have been used to control rabbit populations, but the most effective measures are diseases such as myxomatosis (myxo or mixi, colloquially) and calicivirus. In Europe, where rabbits are farmed on a large scale, they are protected against myxomatosis and calicivirus with a genetically modified virus. The virus was developed in Spain, and is beneficial to rabbit farmers. If it were to make its way into wild populations in areas such as Australia, it could create a population boom, as those diseases are the most serious threats to rabbit survival. Rabbits in Australia and New Zealand are considered to be such a pest that land owners are legally obliged to control them.[26][27]

When introduced into a new area, rabbits can overpopulate rapidly, becoming a nuisance, as on this university campus

In culture and literature

Rabbits are often used as a symbol of fertility or rebirth, and have long been associated with spring and Easter as the Easter Bunny. The species' role as a prey animal also lends itself as a symbol of innocence, another Easter connotation.

Additionally, rabbits are often used as symbols of playful sexuality, which also relates to the human perception of innocence, as well as its reputation as a prolific breeder.

Folklore and mythology

The rabbit often appears in folklore as the trickster archetype, as he uses his cunning to outwit his enemies.

  • In Aztec mythology, a pantheon of four hundred rabbit gods known as Centzon Totochtin, led by Ometotchtli or Two Rabbit, represented fertility, parties, and drunkenness.
  • In Central Africa, "Kalulu" the rabbit is widely known as a tricky character, getting the better of bargains.[citation needed]
  • In Chinese literature, rabbits accompany Chang'e on the Moon. Also associated with the Chinese New Year (or Lunar New Year), rabbits are also one of the twelve celestial animals in the Chinese Zodiac for the Chinese calendar. It is interesting to note that the Vietnamese lunar new year replaced the rabbit with a cat in their calendar, as rabbits did not inhabit Vietnam.
  • A rabbit's foot is carried as an amulet believed to bring good luck. This is found in many parts of the world, and with the earliest use being in Europe around 600 B.C.[28]
  • In Japanese tradition, rabbits live on the Moon where they make mochi, the popular snack of mashed sticky rice. This comes from interpreting the pattern of dark patches on the moon as a rabbit standing on tiptoes on the left pounding on an usu, a Japanese mortar (See also: Moon rabbit).
  • In Jewish folklore, rabbits (shfanim שפנים) are associated with cowardice, a usage still current in contemporary Israeli spoken Hebrew (similar to English colloquial use of "chicken" to denote cowardice).
  • In Korean mythology, like in Japanese, presents rabbits living on the moon making rice cakes (Tteok in Korean).
  • In Native American Ojibwe mythology, Nanabozho, or Great Rabbit, is an important deity related to the creation of the world.
  • A Vietnamese mythological story portrays the rabbit of innocence and youthfulness. The Gods of the myth are shown to be hunting and killing rabbits to show off their power.

On the Isle of Portland in Dorset, UK, the rabbit is said to be unlucky and speaking its name can cause upset with older residents. This is thought to date back to early times in the quarrying industry, where piles of extracted stone (not fit for sale) were built into tall rough walls (to save space) directly behind the working quarry face; the rabbit's natural tendency to burrow would weaken these "walls" and cause collapse, often resulting in injuries or even death. The name rabbit is often substituted with words such as “long ears” or “underground mutton”, so as not to have to say the actual word and bring bad luck to oneself. It is said that a public house (on the island) can be cleared of people by calling out the word rabbit and while this was very true in the past, it has gradually become more fable than fact over the past 50 years. See also Three hares.

Other fictional rabbits

The rabbit as trickster appears in American popular culture; for example the Br'er Rabbit character from African-American folktales and Disney animation; and the Warner Bros. cartoon character Bugs Bunny.

Anthropomorphized rabbits have appeared in a host of works of film, literature, and technology, notably the White Rabbit and the March Hare in Lewis Carroll's Alice's Adventures in Wonderland; in the popular novels Watership Down, by Richard Adams (which has also been made into a movie) and Rabbit Hill by Robert Lawson, as well as in Beatrix Potter's Peter Rabbit stories.

Urban legends

It was commonly believed that pregnancy tests were based on the idea that a rabbit would die if injected with a pregnant woman's urine. This is not true. However, in the 1920s it was discovered that if the urine contained the hCG, a hormone found in the bodies of pregnant women, the rabbit would display ovarian changes. The rabbit would then be killed to have its ovaries inspected, but the death of the rabbit was not the indicator of the results. Later revisions of the test allowed technicians to inspect the ovaries without killing the animal. A similar test involved injecting Xenopus frogs to make them lay eggs, but animal tests for pregnancy have been made obsolete by faster, cheaper, and simpler modern methods.

Classifications

Eastern Cottontail (Sylvilagus floridanus)

Rabbits and hares were formerly classified in the order Rodentia (rodent) until 1912, when they were moved into a new order Lagomorpha. This order also includes pikas.

Order Lagomorpha

See also

References

  1. ^ a b c "Rabbit Habitats". http://courses.ttu.edu/thomas/classpet/1998/rabbit1/new_page_2.htm. Retrieved 2009-07-07. 
  2. ^ a b c "rabbit". Encyclopædia Britannica (Standard ed.). Chicago: Encyclopædia Britannica, Inc.. 2007. 
  3. ^ "Rabbits: Rabbit feet". http://en.allexperts.com/q/Rabbits-703/rabbit-feet-1.htm. Retrieved 2010-07-13. 
  4. ^ Brown, Louise (2001). How to Care for Your Rabbit. Kingdom Books. p. 6. ISBN 978-1-85279-167-4. 
  5. ^ Ferrets, Rabbits, and Rodents: Clinical Medicine and Surgery
  6. ^ "Feeding the Pet Rabbit"
  7. ^ Dr. Byron de la Navarre's "Care of Rabbits" Susan A. Brown, DVM's "Overview of Common Rabbit Diseases: Diseases Related to Diet"
  8. ^ Fedriani, J.M., Palomares, F., M. Delibes 1999. Niche relations among three sympatric Mediterranean carnivores. Oecologia 121: 138-148
  9. ^ Sharon L. Crowell Davis, Behavior of Exotic Pets. Wiley Blackwell, 2010, p.70
  10. ^ Susan E. Davis and Margo DeMello, Stories Rabbits Tell: A Natural And Cultural History of A Misunderstood Creature. Lantern Books, 2003, p.27.
  11. ^ "40 Winks?" Jennifer S. Holland, National Geographic Vol. 220, No. 1. July 2011.
  12. ^ "Rabbit Pictures & Facts: Diet, Digestive Tract, and Reproduction". Fohn.net. http://fohn.net/rabbit-pictures-facts/rabbit-diet-digestive-tract-reproduction.html. Retrieved 2010-08-30. 
  13. ^ Animal Lifespans from Tesarta Online (Internet Archive)
  14. ^ The Life Span of Animals from Dr Bob's All Creatures Site
  15. ^ "What's the lifespan of a rabbit?". House Rabbit Society. http://www.rabbit.org/fun/life-span.html. Retrieved 2010-09-27. 
  16. ^ "Information for Rabbit Owners — Oak Tree Veterinary Centre". Oaktreevet.co.uk. http://www.oaktreevet.co.uk/Pages/leaflets/rabbit%20general.htm. Retrieved 2010-08-30. 
  17. ^ The Private Life of the Rabbit, R. M. Lockley, 1964. Chapter 10.
  18. ^ "True or False? Rabbits are physically incapable of vomiting. (Answer to Pop Quiz)". http://www.rabbit.org/fun/answer11.html. 
  19. ^ "Children and Rabbits". Rabbit.org. http://www.rabbit.org/faq/sections/children.html. Retrieved 2010-08-30. 
  20. ^ 'Traditional Moroccan Cooking, Recipes from Fez', by Madame Guinadeau. (Serif, London, 2003). ISBN 1-897959-43-5.
  21. ^ "Rabbit: From Farm to Table". http://www.fsis.usda.gov/Factsheets/Rabbit_from_Farm_to_Table/index.asp. 
  22. ^ "How to Cook Everything :: Braised Rabbit with Olives". 2008. Archived from the original on 2008-05-17. http://web.archive.org/web/20080517134208/http://www.howtocookeverything.tv/htce/TakeOnTheRecipes/detail/recipeId-24.html. Retrieved 2008-07-17. 
  23. ^ [1] North Dakota Dept. of Ag.
  24. ^ "Tularemia (Rabbit fever)". Health.utah.gov. 2003-06-16. http://health.utah.gov/epi/fact_sheets/tularem.html. Retrieved 2010-08-30. 
  25. ^ Houdebine, Louis-Marie; Fan, Jianglin (1 June 2009). Rabbit Biotechnology: Rabbit Genomics, Transgenesis, Cloning and Models. シュプリンガー・ジャパン株式会社. pp. 68–72. ISBN 978-90-481-2226-4. http://books.google.com/books?id=AYCC8FLbX2wC&pg=PA69. Retrieved 8 October 2010. 
  26. ^ "Feral animals in Australia — Invasive species". Environment.gov.au. 2010-02-01. http://www.environment.gov.au/biodiversity/invasive/ferals/index.html. Retrieved 2010-08-30. 
  27. ^ "Rabbits — The role of government — Te Ara Encyclopedia of New Zealand". Teara.govt.nz. 2009-03-01. http://www.teara.govt.nz/en/rabbits/7. Retrieved 2010-08-30. 
  28. ^ Ellis, Bill: Lucifer Ascending: The Occult in Folklore and Popular Culture (University of Kentucky, 2004) ISBN 0-8131-2289-9

Further reading

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Leporidae

Leporids are over 60 species of rabbits and hares which form the family Leporidae. The leporids, together with the pikas, constitute the mammalian order Lagomorpha. Leporids differ from pikas in having short furry tails, and elongated ears and hind legs. The name leporid is simply an abbreviation of the family name Leporidae meaning animals resembling "lepus", Latin for hare.

Members of all genera except Lepus are usually referred to as rabbits, while members of Lepus (which accounts for almost half the species) are usually called hares. However the distinction between these two common names does not map completely into current taxonomy, since jackrabbits are members of Lepus, and members of the genera Pronolagus and Caprolagus are sometimes called hares.

Leporids are native across the world except Antarctica, and in Oceania where their introduction is a significant threat for the native mammals in Australia.

Contents

Characteristics

Leporids are small to moderately sized mammals, adapted for rapid movement. They have long hind legs, with four toes on each foot, and shorter fore legs, with five toes each. The soles of their feet are hairy, to improve grip while running, and they have strong claws on all of their toes. Leporids also have distinctive, elongated and mobile ears, and they have an excellent sense of hearing. Their eyes are large, and their night vision is good, reflecting their primarily nocturnal or crepuscular mode of living.[2]

Leporids range in size from the Pygmy Rabbit (Brachylagus idahoensis), with a head and body length of 25–29 cm, and a weight of around 300 grams, to the European Hare (Lepus europaeus), which is 50–76 cm in head-body length, and weighs from 2.5 to 5 kilograms.

Both rabbits and hares are almost exclusively herbivorous (with exceptions among the members of Lepus),[3][4] feeding primarily on grasses and herbs, although they also eat leaves, fruit, and seeds of various kinds. They are coprophagous, as they pass food through their digestive systems twice, first expelling it as soft green feces, which they then re-ingest, eventually producing hard, dark fecal pellets. Like rodents, they have powerful front incisor teeth, but they also have a smaller second pair of incisors to either side of the main teeth in the upper jaw, and the structure is different from that of rodent incisors. Also like rodents, leporids lack any canine teeth, but they do have more cheek teeth than rodents do. Their jaw also contains a large diastema. The dental formula of most, though not all, leporids is: Upper: 2.0.3.3, lower: 1.0.2.3

They have adapted to a remarkable range of habitats, from desert to tundra, forests, mountains, and swampland. Rabbits generally dig permanent burrows for shelter, the exact form of which varies between species. In contrast, hares rarely dig shelters of any kind, and their bodies are more suited to fast running than to burrowing.[2]

The gestation period in leporids varies from around 28 to 50 days, and is generally longer in the hares. This is in part because young hares, or leverets, are born fully developed, with fur and open eyes, while rabbit kits are naked and blind at birth, having the security of the burrow to protect them.[2] Leporids can have several litters a year, which can cause their population to expand dramatically in a short period of time when resources are plentiful.

Evolution

Serengetilagus praecapensis skull, Naturkundemuseum, Berlin

The oldest known leporid species date from the late Eocene, by which time the family was already present in both North America and Asia. Over the course of their evolution, this group has become increasingly adapted to lives of fast running and leaping. For example, Palaeolagus, an extinct rabbit from the Oligocene of North America, had shorter hind legs than modern forms (indicating it ran rather than hopped) though it was in most other respects quite rabbit-like.[5] Two as yet unnamed fossil finds—dated ~48 Ma (from China) and ~53 Ma (India)—while primitive, display the characteristic leporid ankle, thus pushing the divergence of Ochotonidae and Leporidae yet further into the past.[6]

Classification

Family Leporidae:[1] rabbits and hares

See also

References

  1. ^ a b Hoffman, Robert S.; Smith, Andrew T. (16 November 2005). "Order Lagomorpha (pp. 185-211". In Wilson, Don E., and Reeder, DeeAnn M., eds. Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press, 2 vols. (2142 pp.). pp. 194–211. ISBN 978-0-8018-8221-0. OCLC 62265494. http://www.bucknell.edu/msw3. 
  2. ^ a b c Chapman, J. & Schneider, E. (1984). Macdonald, D.. ed. The Encyclopedia of Mammals. New York: Facts on File. pp. 714–719. ISBN 0-87196-871-1. 
  3. ^ Best, Troy L.; Henry, Travis Hill (1994). "Lepus arcticus". Mammalian Species (American Society of Mammalogists) (457): 1–9. June 2, 1994. doi:10.2307/3504088. JSTOR 3504088. OCLC 46381503 
  4. ^ "Snowshoe Hare". eNature: FieldGuides. eNature.com. 2007. http://www.enature.com/fieldguides/detail.asp?curFamilyID=556&curGroupID=5&lgfromWhere=&curPageNum=2. Retrieved 2008-03-23. 
  5. ^ Savage, RJG, & Long, MR (1986). Mammal Evolution: an illustrated guide. New York: Facts on File. pp. 128–129. ISBN 0-8160-1194-X. 
  6. ^ Handwerk, Brian (2008-03-21). "Easter Surprise: World's Oldest Rabbit Bones Found". National Geographic News (National Geographic Society). http://news.nationalgeographic.com/news/2008/03/080321-rabbit-bones.html. Retrieved 2008-03-23. 
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