My NDNs have 11 cats, all rescues. The feline neighbours are making sure I have no wild birds or wildlife (5 shrews, 4 birds, 2 nestlings this week and that's just my side) as they pop in and out of the garden. The NDNs also have big rescue dogs not allowed out of their house because of cats/livestock in their small garden - unless the dogs are walked. My question is: what can kindly deter the cats? I have a fence on three sides, but the cats scramble over. Also an open area to the back which is hedging.