A pig is any of the animals in the genus Sus, within the even-toed ungulate family Suidae. Pigs include the domestic pig and its ancestor, the common Eurasian wild boar (Sus scrofa), along with other species; related creatures outside the genus include the peccary, the babirusa, and the warthog. Pigs, like all suids, are native to the Eurasian and African continents. Juvenile pigs are known as piglets. Pigs are highly social and intelligent animals.
Temporal range: Early Pleistocene to recent
|Bornean bearded pig at the London Zoo.|
With around 1 billion individuals alive at any time, the domestic pig is among the most populous large mammals in the world. Pigs are omnivores and can consume a wide range of food, similar to humans. Pigs can harbour a range of parasites and diseases that can be transmitted to humans. Because of the similarities between pigs and humans, pigs are used for human medical research.
The Online Etymology Dictionary provides anecdotal evidence as well as linguistic, saying that the term derives
probably from Old English *picg, found in compounds, ultimate origin unknown. Originally "young pig" (the word for adults was swine). Apparently related to Low German bigge, Dutch big ("but the phonology is difficult" -- OED). ... Another Old English word for "pig" was fearh, related to furh "furrow," from PIE *perk- "dig, furrow" (source also of Latin porc-us "pig," see pork). "This reflects a widespread IE tendency to name animals from typical attributes or activities" [Roger Lass]. Synonyms grunter, porker are from sailors' and fishermen's euphemistic avoidance of uttering the word pig at sea, a superstition perhaps based on the fate of the Gadarene swine, who drowned.
The Online Etymology Dictionary also traces the evolution of sow, the term for a female pig, through various historical languages:
Old English sugu, su "female of the swine," from Proto-Germanic *su- (cognates: Old Saxon, Old High German su, German Sau, Dutch zeug, Old Norse syr), from PIE root *su- (cognates: Sanskrit sukarah "wild boar, swine;" Avestan hu "wild boar;" Greek hys "swine;" Latin sus "swine", suinus "pertaining to swine"; Old Church Slavonic svinija "swine;" Lettish sivens "young pig;" Welsh hucc, Irish suig "swine; Old Irish socc "snout, plowshare"), possibly imitative of pig noise; note that Sanskrit sukharah means "maker of (the sound) su.
It is entirely likely that the word to call pigs, "soo-ie," is similarly derived.
Description and behaviour
A typical pig has a large head with a long snout that is strengthened by a special prenasal bone and by a disk of cartilage at the tip. The snout is used to dig into the soil to find food and is a very acute sense organ. There are four hoofed toes on each trotter (foot), with the two larger central toes bearing most of the weight, but the outer two also being used in soft ground.
The dental formula of adult pigs is 188.8.131.52, giving a total of 44 teeth. The rear teeth are adapted for crushing. In the male, the canine teeth form tusks, which grow continuously and are sharpened by constantly being ground against each other.
Occasionally, captive mother pigs may savage their own piglets, often if they become severely stressed. Some attacks on newborn piglets are non-fatal. Others may cause the death of the piglets and sometimes, the mother may eat the piglets. It is estimated that 50% of piglet fatalities are due to the mother attacking, or unintentionally crushing, the newborn pre-weaned animals.
Scientists have recently discovered that pigs can exhibit a cognitive bias and are optimists or pessimists, similar to humans. In a study by the University of Lincoln, 36 pigs were tested. They were placed in a room with two food bowls at each end of the room. One food bowl contained sugar-coated chocolate sweets and the other contained coffee beans. Optimistic pigs were likely to check if there was a third bowl filled with sweets. However pessimistic pigs would not even bother checking if the bowl was filled with sweets or not. It was said that "Pro-active pigs were willing to see whether there was a positive outcome in the mystery bowl". The study shows that non-human animals can share similar traits with humans.
Distribution and evolution
The ancestor of the domesticated pig is the wild boar, which is one of the most numerous and widespread large mammals. Its many subspecies are native to all but the harshest climates of continental Eurasia and its islands and Africa as well, from Ireland and India to Japan and north to Siberia.
Long isolated from other pigs on the many islands of Indonesia, Malaysia, and the Philippines, pigs have evolved into many different species, including wild boar, bearded pigs, and warty pigs. Humans have introduced pigs into Australia, North and South America, and numerous islands, either accidentally as escaped domestic pigs which have gone feral, or as wild boar.
Habitat and reproduction
The wild pig (Sus scrofa) can take advantage of any forage resources. Therefore, it can live in virtually any productive habitat that can provide enough water to sustain large mammals such as pigs. If there is increased foraging of wild pigs in certain areas, it can cause a nutritional shortage which can cause the pig population to decrease. If the nutritional state returns to normal, the pig population will most likely rise due to the pigs' naturally increased reproduction rate.
Diet and foraging
Pigs are omnivores, which means that they consume both plants and animals. In the wild, they are foraging animals, primarily eating leaves, grasses, roots, fruits, and flowers. In confinement, pigs are fed mostly corn and soybean meal with a mixture of vitamins and minerals added to the diet. Traditionally they were raised on dairy farms and called "mortgage lifters" due to their ability to use the excess milk as well as whey from cheese and butter making combined with pasture. Older pigs will consume three to five gallons of water per day.
Relationship with humans
Domesticated pigs, called swine, are raised commercially for meat (generally called pork, hams, gammon or bacon), as well as for leather. Their bristly hairs are also used for brushes. Due to their common use as livestock, adult swine have gender specific names: the males are boars and the females are sows. In Britain, the word hog can refer to a castrated adult male pig. Young swine are called piglets or pigs. Pork is one of the most popular forms of meat for human consumption, accounting for 38% of worldwide meat production.
Both wild and feral pigs are commonly hunted. Some breeds of pig, such as the Asian pot-bellied pig, are kept as pets. There are two instances in the 2000s where farm hogs ate human beings. The first was in 2004 in Romania, where a woman died after her ears, half of her face and her fingers were consumed; the other in 2012 in Oregon—whether the farmer was killed by his hogs or died of another cause before being consumed is unknown.
The relatively short, stiff, coarse hairs of the pig are called bristles, and were once so commonly used in paintbrushes that in 1946 the Australian Government launched Operation Pig Bristle. In May 1946, in response to a shortage of pig bristles for paintbrushes to paint houses in the post-World War II construction boom, the Royal Australian Air Force (RAAF) flew in 28 short tons of pig bristles from China, their only commercially available source at the time.
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- Sus ahoenobarbus Huet, 1888 – Palawan bearded pig
- †Sus australis Han, 1987 – Early Pleistocene of China
- Sus barbatus Müller, 1838 – Bornean bearded pig
- †Sus bijiashanensis Han et al., 1975 – Early Pleistocene of China
- Sus bucculentus Heude, 1892 – Heude's pig or Indo-Chinese (or Vietnam) warty pig
- Sus cebifrons Heude, 1888 – Visayan warty pig
- Sus celebensis Müller & Schlegel, 1843 – Celebes warty pig or Sulawesi warty pig
- †Sus falconeri – Pleistocene of the Siwalik region, India
- †Sus houi Qi et al., 1999 – Pleistocene of China
- †Sus hysudricus
- †Sus jiaoshanensis Zhao, 1980 – Early Pleistocene of China
- †Sus liuchengensis Han, 1987 – Early Pleistocene of China
- †Sus lydekkeri Zdansky, 1928 – Pleistocene of China
- †Sus offecinalis Koenigswald, 1933 – China
- Sus oliveri Groves, 1997 – Oliver's warty pig or Mindoro warty pig
- †Sus peii Han, 1987 – Early Pleistocene of China
- Sus philippensis Nehring, 1886 – Philippine warty pig
- Sus scrofa – Wild boar Linnaeus, 1758
- †Sus subtriquetra Xue, 1981
- †Sus strozzi
- Sus verrucosus Boie, 1832 – Javan warty pig
- †Sus xiaozhu Han et al., 1975 – Early Pleistocene of China
Pigs have been domesticated since ancient times in the Old World. Archaeological evidence suggests that pigs were being managed in the wild in a way similar to the way they are managed by some modern New Guineans from wild boar as early as 13,000–12,700 BP in the Near East in the Tigris Basin, Çayönü, Cafer Höyük, Nevalı Çori. Remains of pigs have been dated to earlier than 11,400 BP in Cyprus that must have been introduced from the mainland which suggests domestication in the adjacent mainland by then. A separate domestication also occurred in China.
In India, pigs have been domesticated for a long time mostly in Goa and some rural areas for pig toilets. This was also done in China. Though ecologically logical as well as economical, pig toilets are waning in popularity as use of septic tanks and/or sewerage systems is increasing in rural areas.
Pigs were brought to southeastern North America from Europe by Hernando de Soto and other early Spanish explorers. Pigs are particularly valued in China and on certain oceanic islands, where their self-sufficiency allows them to be turned loose, although the practice is not without its drawbacks (see environmental impact).
The domestic pig (Sus scrofa domesticus) is usually given the scientific name Sus scrofa, although some authors call it S. domesticus, reserving S. scrofa for the wild boar. It was domesticated approximately 5,000 to 7,000 years ago. Their coats are coarse and bristly. They are born brownish coloured and tend to turn more grayish coloured with age. The upper canines form sharp distinctive tusks that curve outward and upward. Compared to other artiodactyles, their head is relatively long, pointed, and free of warts. Their head and body length ranges from 0.9 to 1.8 m (35 to 71 in) and they can weigh between 50 and 350 kg (110 and 770 lb).
In August 2015, a study looked at over 100 pig genome sequences to ascertain their process of domestication. The process of domestication was assumed to have been initiated by humans, involved few individuals and relied on reproductive isolation between wild and domestic forms. The study found that the assumption of reproductive isolation with population bottlenecks was not supported. The study indicated that pigs were domesticated separately in Western Asia and China, with Western Asian pigs introduced into Europe where they crossed with wild boar. A model that fitted the data included admixture with a now extinct ghost population of wild pigs during the Pleistocene. The study also found that despite back-crossing with wild pigs, the genomes of domestic pigs have strong signatures of selection at DNA loci that affect behavior and morphology. The study concluded that human selection for domestic traits likely counteracted the homogenizing effect of gene flow from wild boars and created domestication islands in the genome. The same process may also apply to other domesticated animals. 
Cultural and religious reference to pigs
Pigs appear in the traditional and popular arts, media, and cultures of many societies, where they sometimes carry religious symbolism. In Asia the wild boar is one of 12 animal images comprising the Chinese zodiac, while in Europe the boar represents a standard charge in heraldry. In Islam and Judaism pigs and those who handle them are viewed negatively, and the consumption of pork is forbidden. Pigs are frequently alluded to in folk art, idioms, metaphors, and proverbs, and also occasionally in parables (e.g. Parable of the Prodigal Son). "the three little pigs" is a folk-tale and "Peppa Pig" is a popular British television show.
Domestic pigs that have escaped from farms or were allowed to forage in the wild, and in some cases wild boars which were introduced as prey for hunting, have given rise to large populations of feral pigs in North and South America, Australia, New Zealand, Hawaii, and other areas where pigs are not native. Accidental or deliberate releases of pigs into countries or environments where they are an alien species have caused extensive environmental change. Their omnivorous diet, aggressive behaviour, and their feeding method of rooting in the ground all combine to severely alter ecosystems unused to pigs. Pigs will even eat small animals and destroy nests of ground nesting birds. The Invasive Species Specialist Group lists feral pigs on the list of the world's 100 worst invasive species and says:
Feral pigs like other introduced mammals are major drivers of extinction and ecosystem change. They have been introduced into many parts of the world, and will damage crops and home gardens as well as potentially spreading disease. They uproot large areas of land, eliminating native vegetation and spreading weeds. This results in habitat alteration, a change in plant succession and composition and a decrease in native fauna dependent on the original habitat.
Pigs can harbour a range of parasites and diseases that can be transmitted to humans. These include trichinosis, Taenia solium, cysticercosis, and brucellosis. Pigs are also known to host large concentrations of parasitic ascarid worms in their digestive tract. According to the USDA fact sheet modern pork can be enjoyed cooked rare at 145 °F (63 °C) with pink in the middle. Today trichinellosis infections from eating undercooked pork are rare in more technologically developed countries due to refrigeration, health laws, and public awareness. Some religious groups have dietary laws that make pork an "unclean" meat, and adherents sometimes interpret these health issues as validation of their views.
Pigs have health issues of their own. Pigs have small lungs in relation to their body size and are thus more susceptible than other domesticated animals to fatal bronchitis and pneumonia. Some strains of influenza are endemic in pigs (see swine influenza). Pigs also can acquire human influenza.
Pigs can be aggressive in defending themselves and their young. Pig-induced injuries are thus not unusual in areas where pigs are raised or where they form part of the wild or feral fauna.
In November 2012 scientists managed to sequence the genome of the domestic pig. The similarities between the pig and human genomes mean that the new data may have wide applications in the study and treatment of human genetic diseases.
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