A “Migration Alert” has been issued as hundreds of thousands of birds are expected to traverse the Chicago area overnight.
According to the latest updates from the Cornell Lab, birds are expected to be especially active over the Chicago area amid their spring migration late Monday night and into Tuesday morning, taking advantage of cool conditions and gentle winds aloft to make their way toward their summer nesting locations.
As a result, Chicago-area residents are being asked to take steps to help protect their feathered friends, and that includes shutting off non-essential lights among other steps.
Here’s everything you need to know ahead of the significant migration expected to take place Monday night.
When do birds typically migrate?
Peak migration for birds over the state of Illinois occurs in mid-to-late May, with hundreds of different species heading north for the summer breeding season.
Those migration flights for songbirds and other species typically take place in the overnight hours. According to experts, birds typically take flight 30-to-45 minutes after sunset, with the greatest number of birds in flight typically seen approximately two-to-three hours later.
When should residents turn lights off?
One of the best ways to help protect birds is to turn off lights during peak migration times.
According to Birdcast, the best time to turn off or dim exterior lights and interior lights is between the hours of 11 p.m. and 6 a.m., when most birds are active.
Bright lights can disorient and attract birds, making them vulnerable to collisions and to predators on the ground, according to the website.
Hundreds of millions of birds are killed each year in collisions with buildings, and residents and businesses are being asked to do their part to keep the creatures safe.
In addition to turning off unneeded exterior lights, residents and businesses are also asked to dim or turn off lights in lobbies, and to draw blinds to help keep light from escaping through windows.
Finally, exterior lights should be aimed downward and be well-shielded so that birds aren’t attracted to them.
Are there other steps?
Another key step in protecting birds is to bring pet cats inside during overnight hours.
According to the American Bird Conservancy, cats kill an estimated 2.4 billion birds in the United States every year, and during migration season those impacts can be even more devastating, as exhausted birds typically seek refuge in plants and trees to rest on their journeys, making them vulnerable to attack.
Since cats like to hunt at night, active migrating birds can be a target, leading to experts asking residents to keep animals inside when possible.
