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pig
A pig is any of the animals in the genus ''Sus'', within the Suidae family of even-toed ungulates. 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 omnivores and are highly social and intelligent animals.
==Description and behaviour==
A typical pig has a large head with a long snout which is strengthened by a special prenasal bone and by a disk of cartilage at the tip.〔(【引用サイトリンク】title=ADW: Sus scrofa: INFORMATION )〕 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.〔(【引用サイトリンク】title=American Wild Game / Feral Pigs / Hogs / Pigs / Wild Boar: )〕
The dental formula of adult pigs is , 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.〔(North Carolina Pork Conference ) – Management Tips to Reduce Pre-Weaning Mortality. 2002. North Carolina State University.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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