Every year, between 365 million and one billion birds
______ (20) thought to be killed in building collisions in the US. More than half of those crashes are actually with low-rise buildings, such as people's homes. Birds may collide with them in small numbers per building, but it adds up, as houses are so widespread. However, big lit-up buildings such as skyscrapers may kill hundreds of birds at once.
______ (21) October 2023, nearly 1000 birds
______ (22) in a single night during their autumn migration from hitting a skyscraper in Chicago. Many birds migrate by night, and use the
______ (23) to find their way. During their night migration, they are often seen gathering around or crashing into lit-up windows and structures. One explanation is that they may usually
______ (24) towards light sources, but unfortunately, the artificial light confuses and traps them.
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