Light pollution Light is one of the more common threats to sufficient sleep for birds living in environments with anthropogenic noise. This threat is called "artificial light pollution at night" , or ALAN.
<clarity> Light pollution Light is one of the more common threats to sufficient sleep for birds living in environments with anthropogenic noise. This threat is called "artificial light pollution at night" , or ALAN.
Light pollution Light is one of the more common threats to sufficient sleep for birds living in anthropogenic environments, known as "artificial light pollution at night" , or ALAN.