The U.S., the largest importer of wildlife products in the world, brings in nearly 10,000 species of plants and animals into the country legally, some of which have a high potential to become invasive species. A recent study assessed these imported species and identified 32 as having the highest risk for becoming invasive, posing threats to local ecosystems and to human health. These include venomous reptiles like puff adders and spitting cobras, and freshwater fish; similar species that have already established themselves as invasives have wrought havoc on native wildlife and caused widespread economic harm. The researchers say their findings can help authorities regulate the imports of such high-risk species and add them to watchlists to prevent them from becoming invasives.