Feral Cats are household cats that aren't domesticated and live outdoors, and are common globally.
Bird Deaths
Feral cats (and even most household cats) are by and far the biggest cause of human-related bird deaths. In the United States, cats were responsible for an estimated 2.4 billion bird deaths in 2017. That eclipses collisions due to wind turbines, windows, industry, and other causes combined, with cats causes over three quarters of bird deaths.
[1] This makes them the most problematic invasive species around.
- ↑ https://www.fws.gov/library/collections/threats-birds
