The basic definition of an invasive species is "one that is not native to an ecosystem and which causes, or is likely to cause, economic or environmental health or harm to human health." The U.S. Fish & Wildlife Service is quite concerned with such species, as their primary responsibility is "the conservation of the nation's fish, wildlife, and plants." The materials here are divided into seven sections, including News and Resources, Laws and Regulations, and What You Can Do. This last section is a great resource for the general public, as it contains information on helping to prevent the spread of invasive plants, fact sheets on aquariums, and so on. Scholars and others will appreciate the Laws and Regulations area, which features the complete text of key laws and executive orders dealing with invasive species and their management.