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Invasive species are organisms (usually transported by humans) which successfully establish themselves in, and then overcome, otherwise intact, pre-existing native ecosystems. Expanding global trade and communication have contributed to the mixing of faunas and floras across biogeographical boundaries. This process, together with habitat destruction, has been a major cause of extinction throughout the world in the past few hundred years.

The scientific investigation of invasive species includes chronicling their spread and impact, but also study of why and how some species are successful invaders.

Biologists are trying to characterize the ability to invade, in the hope that incipient invasions can be predicted and stopped.
Submit sites in this category that are about foreign species that have been transported to a new location and overtaken the native environment. Topics studied here would include taking a look at the details of the problem, research studies, and strategies for the eradication of non-native species.

Websites about related topics that are not specifically geared towards the preservation of biodiversity, such as weed management, and pest control should be listed in other categories such as the Science/Agriculture/Pest_Management category.

Webpages that are or the general biology of specific animals and plants, even though some there may be some mention of invasive species should be submitted to the Science/Biology/Botany category.