Naw there just to lazy. I’m no expert on cats but i do have close to 50 years observation time around them and their wilder cousin the Bob-Cat. From my observation, I’ve seen very few birds taken by either. What i have observed is allot of rodents and small lizards and bugs taken by cats. I would love to see the study proving the damage cats do to the bird population. I lose more of my Quail and Dove to Raptors than i do cats or other varmints.
I don’t know about how much damage they actually do. The fact of the matter is, they don’t belong on someone else’s property.
My family owns a farm and stray or feral cats are a problem. (FWIW: we use Havahart traps and call animal control...usually)
My dad and I are quail hunters, BTW. He used to raise them but is now more into hunting wild turkey.
As I said in a previous post, I think catching and killing song birds is probably more a recreation for well-fed pet cats than it is a source of nutrition for truly feral cats - small rodents are more plentiful and easier to catch. Still, feral cats pose a number of other problems which might justify killing them. Catch and release spaying/neutering might be just as good in the long term - the biggest issue is irrsponisble idiots who keep releasing more cats into the wild.