Illinois' geographical position makes it an attractive crossing point for millions of birds during migration periods, as corroborated by data from BirdCast. NBC Chicago reports that nearly 8.5 million birds were observed crossing the state within a 24-hour period between yesterday and today. From the start of migration in August, an estimated 840 million birds have passed through Illinois, reaching a peak of 57 million birds on October 5th, the busiest day so far.
Bird activity peaks to be active during overnight hours where temperatures are cooler and conditions are calmer. Peak migration typically occurs two-to-three hours post-sunset, between 10 p.m. and 12 a.m. However, birds may face numerous threats along their migratory path, particularly in urban environments such as Chicago. As per CBS, approximately 1,000 birds lost their lives on a single day after crashing into the windows of the McCormick Place convention center, thereby exposing the hazards that city structures with bright lights and glass windows pose.
The Chicago Bird Collision Monitors, a nonprofit organization that monitors migratory patterns, has warned about the risks posed by human actions, stating that about 70,000 birds travel through the Chicago area overnight. Prolonged human intervention, particularly unnecessary exterior and interior lighting in high-rises, seems to pose a significant risk to birds on their journey. An effective strategy to protect these birds includes turning off lights and closing curtains or blinds during peak migration hours.
Besides individual residents, companies that are located in high-rise buildings also need to take action to ensure birds' safe migration. Companies are encouraged to turn off their lights past 11 p.m. during peak migration times, which can significantly drop the number of bird fatalities resulting from disorientation that can be caused by bright lights during the overnight hours.
With fall migration season in progress, BirdCast predicts a potential migration surge across the central United States, including Illinois. Approximately 276 million birds are expected to be in migration across the continental United States towards October's end, reinforcing the necessity for immediate and effective measures in ensuring their safety. For in-depth insights into migration and the means to safeguard these avian travelers, the Audubon Society website can be visited.
