Um, I have 3 of the little bastards actually and thankfully they all go and sh!t in other people's gardens haha. BUT, Snorky, there is little evidence to suggest the decline in small songbirds is due to cats. In fact it is more likely due to the paving over of front gardens, loss of habitat for insects etc resulting in loss of food for the birdies. My cats do VERY occasionally bring a bird back and I always chastise them thoroughly! I have tried bells but they keep getting the collars off, anyway bells don't help if they find a nest.