From DWR California Invasive Species Action Week, which takes place June 6 to 14, is a statewide campaign designed to educate the public on non-native species that threaten the State’s natural resources. Examples of these species include, alligator weed, nutria, phragmites, and quagga and zebra mussels. Nonnative plants and animals threaten clean water, flood prevention infrastructure, and natural ecosystems. (more).