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feral pig
A feral pig (from Latin ''fera'', "a wild beast") is a pig (''Sus scrofa'') living in the wild but which has descended from domesticated individuals.
Razorback and wild hog are American colloquialisms, loosely applied to any type of feral domestic pig, wild boar or hybrid in North America; pure wild boar are sometimes called "Russian boar" or "Russian razorbacks". The term "razorback" has also appeared in Australia, to describe feral pigs there.
==Definition==
A feral pig is a domestic pig that has escaped or been released into the wild, and is living more or less as a wild animal; or one that is descended from such animals.〔Cf. (【引用サイトリンク】url=http://www.merriam-webster.com/dictionary/feral )〕 Zoologists generally exclude from the ''feral'' category animals that, although captive, were genuinely wild before they escaped. Accordingly, Eurasian wild boar, released or escaped into habitats where they are not native, such as in North America, are not generally considered feral, although they may interbreed with feral pigs.
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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