Invasive species are species that are not native to Minnesota and cause economic, social, or environmental harm, or harm to human health.Minnesota's natural resources are threatened by a number of invasive species such as zebra mussels, Eurasian watermilfoil, common buckthorn, and emerald ash borer. Invasive species can occur on land or in the water.The DNR works to help prevent the spread and promote the management of invasive species.