City birds chirp for longer than forest birds

New research from Southern Illinois University and Oklahoma State University found links between light pollution responses and eye size, nest type, migration and breeding season. They found these links by comparing vocalization data of bird species in different landscapes.

Whether increased vocalization time due to light pollution has a positive or negative impact on birds’ survival is not so simple to determine. Because for migratory bird species, light pollution has been found to draw them into cities, where they are at higher risk of colliding with glass buildings. Whereas for some other bird species, light pollution could potentially increase their foraging or breeding time, and ultimately increase their chances of survival.