It's estimated that cats kill 1.3–4 billion birds each year in the U.S. alone, with 69% of these kills attributable to feral or unowned cats: https://www.allaboutbirds.org/news/faq-outdoor-cats-and-thei...
"Our data about US were so poor that we needed to add data from other continents"
> cats kill 1.3–4 billion birds each year in the U.S.
"But we still ended somehow with this bold and likeable value made with a mix of pure air, foreign data and statistical spice"
Another case of turd data polished to gold by the magic of science. People will repeat it for decades online.