I know I should be annoyed -- they're apparently pretty pernicious garden pests. But I'm actually pleased that they somehow managed to find their way up to a fourth floor rooftop garden. It makes it feel more like a real garden. And now I know what the gorgeous moth was that I saw up there a few weeks ago sucking nectar from our flowers, with wings that flashed as quickly as a hummingbird's. It even has a cool name -- the hawk or sphinx moth. I have sphinx moths in my garden!
Nature is great. :-)