It's not just desirable plants, insects and animals ready to spring forth into a new season, it's also the invasive species that don't belong here and have no natural predators, often hitchhiking their ways into our lives, lands, air and waters. Pulse editor Debra Fitzgerald talks with Sam Koyen, County of Door's invasive species coordinator, about the county's biggest invasive threats and what's being done to help mitigate their spread.