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Invasive species are arriving in California with increasing frequency. The best time to stop them is before they arrive, and federal, state, and local agencies are keeping their eyes out for new arrivals and threats on the horizon. When they do arrive, Early Detection and Rapid Response are critical to their management. Many detections are made by individuals not associated with any agency or university, and through community/participatory science programs, almost anyone can help to spot the next invasive.