To be fair, housecats probably kill very few birds of endangered species. It's totally plausible to me that windmills are more threatening to some endangered species. But I speak here only of plausibility, not knowledge.
Depends on what you mean by "housecat."
https://news.ufl.edu/archive/2003/0...s-threaten-endangered-species-nationwide.html
But as these cats forage for food and establish their territories, they kill more than a billion small mammals and birds each year, many of which are threatened or endangered, a University of Florida study shows.
https://abcbirds.org/article/articleendangered-hawaiian-gallinules-killed-feral-cats-kauai/
“Feral cats, whether they are dumped on the wildlife refuge by irresponsible owners or they find their way onto the refuge from nearby feral cat feeding stations, are having a very significant and tragic impact on Hanalei National Wildlife Refuge's endangered birds,” said U.S. Fish and Wildlife Service Deputy Project Leader Michael Mitchell.
https://www.smithsonianmag.com/science-nature/moral-cost-of-cats-180960505/
Marra tells the story of Tibbles the cat, who traveled with her owner to an untouched island south of New Zealand in 1894. There, she single-pawedly caused the extinction of the Stephens Island wren, a small, flightless bird found only in that part of the world. Most cats aren’t as deadly as Tibbles, but your average outdoor pet cat still kills around two animals per week, according to the Wildlife Society and the American Bird Conservancy. The solution for these cats is simple, says Marra: Bring them indoors. The Humane Society of the United States agrees.
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