Out of all 1880 imperiled species in the United States, 49% are endangered because of invasive species (Simberloff 1). In fact, invasive species are more of the threat to biodiversity than pollution, harvest, and disease combined. Invasive species threaten biodiversity by causing disease, acting as predators or parasites, or hybridizing with local species. Aside from that, invasive species can be damaging to a habitat, placing ecosystems at risk. Invasive species do this by killing or driving out native species that have important roles in the habitat. Also, they can effect human enterprise, such as fisheries, costing the economy millions of dollars (Simberloff 1). According to a fisherman, “It’s [invasive species] a national problem that is rapidly spreading across Montana. We believe that more than 20 percent of Montana’s illegal fish introduction occurred just in the past 10 years alone”(Bahlmann