An invasive species can refer to any type of species that does not necessarily belong in a certain ecosystem, causing or having the potential to cause economic or environmental harm, as well as harm to human health. Plants, insects, pathogens, diseases, birds, nematodes, and just about anything else can be an invasive species. Invasive species can also come from anywhere in the world. Gypsy moths, for instance, were imported from France for the purpose of silk production – they escaped from their cages and now threaten U.S. forests. Newcastle disease, another invasive species, is a disease that affects birds – causing their heads to twist, as well as death.
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