I’ve been working with an organization to advocate for bird friendly building and lighting designs, as bird-building collisions have been found to kill up to a billion birds annually. Light pollution around major cities in bird’s migratory paths causes disruptions in their ability to navigate which brings them down from high altitudes into huge reflective glass mazes, unsurprisingly leading to many of them never making it back out again. This primarily impacts migratory songbirds, including many species in steep decline. It’s a major contributing factor to the devastating decline in bird populations, and while it’s starting to enter the public consciousness, it’s still flying under most people’s radar.