BIRDS

Light is a big threat to migratory birds, especially young birds that are confused by the maze of lights in cities, they end up colliding with buildings and towers and die or acquire serious injuries.

When the stars and moon become hard to view due to cloudy or polluted skies, migratory birds depend on the Earth's magnetic field for direction. Unfortunately, excessive light is released in electromagnetic waves, which also disrupts the magnetic field of the Earth.

Birds living near lights are provoked to start singing earlier in the morning and extend their chorus further into the evening, because of the lights that surround them. This results in exhaustion and fatigue. 

Some birds nesting near lights start to breed early in the spring. This creates an unsuitable environment for the baby chick since the temperature is not safe for breeding around springtime.

An annual memorial at Ground Zero emits two vertical rays of light to symbolize the Twin Towers in New York. These columns of light disrupt the passage of a myriad of migratory birds. An international study observed that over the course of seven of these nights, more than a million birds were affected.