Each year, outdoor cats kill about 2.4 billion birds in the United States and Canada - many of which are young birds that have recently fledged and are learning how to fend for themselves. This is the top human- caused reason for the loss of birds after habitat destruction. Sometimes, feral cats cannot be dealt with, so we always recommend neutering or fixing them to prevent the colony from growing larger.
Most outdoor-only cats live 2-5 years on average, while indoor cats live for more than 15, so keep cats inside as much as possible. We understand it can be hard, but there are other options like building a catio or collaring your cats. The addition of a collar cover has been scientifically proven to increase the escape rate of birds from cats. Birdsbesafe® is the company that created these collars, and they really do work, so check out their website if you are interested in them. birdsbesafe.com