If you live in an area where 13-year cicadas are expected, you can help determine their range. There is an online database at http://www.magicicada.org/report/report.php where you can report sightings. If you don’t know if cicadas are expected in your area, you can check the maps at http://www.magicicada.org/about/brood_pages/broodXIX.php . A map with the 500 most recent reported sightings is at http://www.magicicada.org/databases/magicicada/map.html . To learn more about periodical cicadas, go to http://www.magicicada.org/magicicada_xix.php .