Most of the time, the invasive species drive out the native ones and affects the ecosystem of their new habitat. An invasive species is a nonnative organism that causes ecological harm after being introduced to a new environment. Invasive species examples All kinds of plants and animals, including trees, fish, rodents, insects, and fungi, can become invasive. 26 Genetic studies can also yield important information about how invasives have spread in an area and their potential to hybridize with native species. For example, the common goldfish (Carassius auratus) was introduced to the United States in 1850 and became extremely widespread, but has shown no adverse effects that characterize invasive species. An invasive species is one that is non-native to the ecosystem in question and causes, or is likely to cause, environmental or economic harm, or harm to human health. Invasive species have contributed significantly to half of all species extinctions since the year 1600; An estimated 42% of the species currently on the federal Endangered Species Act list are imperiled at least in part because of some harm caused by invasive species After a certain amount of time, they adapt to their new environment and begin to colonise it. For example, research studies have been conducted to determine how effective traps are in catching pythons. Through disrupting ecosystems, invasive plants, insects and diseases impair many of the things humans need to sustain a good quality of life – including food and shelter, health, security and social interaction. Invasive alien species are species that have been introduced, either naturally, accidentally or intentionally, into an environment that is not their own. Invasive species are a significant threat to many native habitats and species of the United States and a significant cost to agriculture, forestry, and recreation. 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