For Snowberry, and Thoro, re "Nesting Birds given a chance". You presumably belong to the deluded club who think all cats kill millions of birds, a myth perpetrated by the RSPB and believed by non questioning non-owners of cats. We've had 7 cats, a couple would grab a crashed fledgling who had been learning to fly, but then so will they get taken by magpies, and any visiting sparrowhawk (the 007 of the bird world). Apart from that. they took little interest in birds, especially as they got older. One used to snooze on sunny days near or even under our bird feeders (we have several, placed on the lower branches of a big tree). The birds knew he was OK, and some days he'd come in with bird poop on him. A couple WOULD chase and play with a mouse, if they could get one, but most householders are OK with that? The massive decrease in numbers of birds like starlings cannot logically be attributed to cats, given the lifestyle of the birds (unless you know of legions of farm cats who've gained machine guns?). We still get hordes of garden birds, sparrows, starlings, blackbirds, blue tits, dunnock, wren, chaffinches, and robins, plus goldcrests, greenfinches, a thrush or two, and even (in ultra cold weather) woodpeckers, redwings, that type of thing. But we put out assorted bird food, relevant food scraps, clean water, etc. I suspect that the modern surge in house-building has led to lots of tiny back gardens where people don't think to do such things?