Read the passage and complete each blank with a correct word (A, B, C, or D). Every year, between 365 million and one billion birds ___(11) ___ 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. ___ (12) ___ ...

Read the passage and complete each blank with a correct word (A, B, C, or D).

Every year, between 365 million and one billion birds ___(11) ___ 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. ___ (12) ___ October 2023, nearly 1000 birds ___(13)___in a single night during their autumn migration

from hitting a skyscraper in Chicago.

Many birds migrate by night, and use the ___(14) ___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___(15) ___ towards light sources, but unfortunately, the artificial light confuses and traps them.