In Australia, where I live, pet cats are responsible for a huge amount of damage to wildlife, as per https://invasives.org.au/wp-content/uploads/2023/06/Pet-cat-...

From the linked paper:

Pet cats, despite their valued role as companion animals, are a major threat to wildlife. Collectively, roaming pet cats kill 546 million animals per year in Australia. As such the management of cats has major implications for Australia’s wildlife and ecosystems. [...]

Many owners believe their cats don’t hunt because they never come across evidence of killed animals. However, studies of pet cats using video-tracking collars or scat analysis have established that the vast majority (85%) of the animals killed by pet cats are not brought home.

On average, each roaming, hunting pet cat kills more than three animals every week. The numbers add up. On average, over a year each roaming and hunting pet cat in Australia kills 186 animals. This number includes 110 native animals (40 reptiles, 38 birds and 32 mammals). [...]

[For example] In Mandurah, Western Australia, the disturbance and hunting of just one pet cat and one stray cat caused the total breeding failure of a colony of more than 100 pairs of fairy terns. [...]

The findings presented here are summarised from an analysis of the results of many dozens of studies that was undertaken by the Threatened Species Recovery Hub. The research team included scientists from The University of Queensland, The Australian National University, Charles Darwin University, The University of Sydney and Murdoch University. The research received funding from the Australian Government through the National Environmental Science Program and was published in Wildlife Research.