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List of introduced species
A complete list of introduced species for even quite small areas of the world would be dauntingly long. Humans have introduced more different species to new environments than any single document can hope to record. This list is generally for established species with truly wild populations—not kept domestically or on ranches—that have been seen numerous times, and have breeding populations.
==Australia==
Australia has a huge range of introduced species, so sub-classifications are necessary:
* ''Invasive'' - species have a tendency to spread their range into new areas
* ''Ferals'' - domestic animals (i.e., pets or beasts of burden) that have gone wild
* ''Pests'' - animals that have a direct effect on human standards of living or the environment/ecosystems, have a high rate of reproduction, and are difficult to pin down and be dirty to.
Feral animals that cause the most public concern, and economic and ecological damage include:
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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