Artificial light at night can impact the timing of migration and other seasonal behaviours influenced by the disruption of birds’ biological clocks. It affects their activity levels and energy expenditure and causes disorientation when they fly at night. It can alter birds’behaviours, including migration, foraging and vocal communication. Light pollution can cause other adverse effects on migratory birds. Excessive artificial light at night can disorient birds during their migration, leading to fatal collisions with illuminated buildings, communication towers, and other brightly lit structures. The amount of artificial light on the earth’s surface is increasing by at least 2 percent each year and could be much greater.Įach year, light pollution contributes to the death of millions of birds from collisions. Jacksonville is the only other participating Florida city besides Miami.Light pollution is increasing globally. cities with five others operating statewide or regional programs. Millions of migrating birds that make their way to South Florida in spring and fall face this threat as our high-rises get taller and brighter, which is why the Tropical Audubon Society has joined Audubon’s national Lights Out program. alone, making it one of the greatest human-caused threats to birds, according to the American Bird Conservancy. Now they are tired and looking for a place to rest so they see the reflection of trees in the windows and crash into them … If the buildings are dark, they fly right past them,” said Brian Rapoza of Miami’s Tropical Audubon Society.Ĭollisions with glass windows, walls and other structures kill up to a billion birds a year in the U.S. “Thousands of migrating birds (would) be seen swarming around the World Trade Center, for example. This black-and white warbler collided with a building in downtown Miami July 29, 2021.
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