Many birds migrate at night to and from their wintering & breeding grounds, and during these nocturnal flights many utter short vocalizations to keep in contact. This study involves a transect of listening stations across Lake Ontario's southern coastal plain that monitors the night sky for such migratory bird calls. In spring, this array of automatic bird call monitoring stations surveys for massive coastal flights that sometimes occur when weather conditions do not facilitate northward migration across the Lake. Monitoring stations are located at schools, state parks, private residences, and the Braddock Bay Bird Observatory (see Google map below)

Warbler & sparrow night flight call detections are posted in near real-time to an online archive, and a text alert is available for when extraordinary flights are underway. A map showing the previous evening's warbler & sparrow night flight call totals is posted each morning by 6am (April 15 - May 30). Analysis for calls of other species is reported on the data page.