Oh yes, true. Sometimes I sort of see the missing leaves first (well, I see that there has been something that I actually can´t see any more, of course), and then I find the little beauty sitting there. They are so cute. The butterflies lay just a single egg on the plant, I assume (there is only one caterpiller per plant, most of the time). They stay on their "personal" plant, and it´s fun to watch them grow for a couple of days.