Distribution and Evolution
With around 1 billion individuals alive at any time, the domesticated pig is one of the most numerous large mammals on the planet.
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 climes of continental Eurasia and its islands and Africa as well, from Ireland and India to Japan and north to Siberia. Although it has been exterminated in some areas, its numbers are stable or even increasing rapidly, in most of its native range.
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. These have typically adapted well, and are increasing in number and broadening their range outside human control.
Read more about this topic: Pig
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