You need to keep cats away for the first few days after they fledge, too. They're not up to speed on predator avoidance until a good ten days after fledging. We moved here with a couple of elderly cats but didn't replace them after they died and the local bird and wildlife have increased manyfold. In the immediate vicinity of the farmhouse we have nesting house sparrows, blackbirds (now on their third hatch), swallows, grey wagtails, robins, wrens, blue, great and long-tailed tits, dunnocks, wood pigeons, green and lesser spotted woodpeckers, song thrushes .....