From Wild Birds Unlimited (London, ON):

Fall migration is underway and billions of birds are migrating through North America, mostly under the cover of darkness. Unfortunately, they face an increasing threat: unnatural, man-made light that attracts, disorients, and makes birds vulnerable to collisions with buildings.

The solution is as simple as flipping the switch. Turning off lights dramatically reduces hazards and allows birds to safely proceed with their migratory journeys. For more tips, visit: https://www.wbu.com/lights-out/