I do sympathise that does happen in certain area's Chiz, l've lived here 16 years now and yes the cats have brought home the occasional bird, thankfully managed to save a few. I have not witnessed a dwindling of birds here, on the contrary, the small bird population has increased, and it seem the reason is the reduction in magpie numbers. I've seen those bastards attack and kill smaller birds. I and the majority of neighbours make sure there is plenty food and water for the birds throughout winter.