I agree, not all cats hunt birds. However, there was a study (easy to google) where researchers put cameras on cats, and they found that some outdoor of cats d

I agree, not all cats hunt birds. However, there was a study (easy to google) where researchers put cameras on cats, and they found that some outdoor of cats do kill a monumental number of birds. Overall, I think we can't conclude that any specific cat is doing this, but we can conclude that outdoor cats do greatly reduce the bird population.