Windows may kill up to 988 million birds a year in the United States
"Between 365 million and 988 million birds die from crashing into windows in the United States each year, according to the latest estimate."
"That might equal 2 to 10 percent of the (admittedly uncertain) total bird population of the country. The biggest share of the deaths comes not from glass massacres at skyscrapers but from occasional collisions with the nation’s many small buildings, says Scott Loss of Oklahoma State University in Stillwater." “It’s death by a million nicks.”
Full article: https://www.sciencenews.org/article/windows-may-kill-988-million-birds-year-united-states