Oh no, Jennywren, the cats are a very real threat to anything with fur or feathers. They were feral kittens from a big feral mother that either had the litter here or bought them over from the forest. I caught two and confined them to a roofed dog yard till I tamed them, but unfortunately the others disappeared. They are terrific hunters, we'd always see them on the roof of buildings here, or up the callistemons. They got rid of the sparrow plague we had, they naturally keep mouse numbers down(it's a grain growing area), and it's a foolhardy possum that thinks this garden is its home. They didn't find that nest though, so the parents probably lured or chased them away. The New Holland honeyeaters and many other birds frequent the garden, if they kill any birds it's usually bigger, maybe slower ones.