
Cheers Wurzel - you're not the only one that's been fooled by that SWF shot

Re Marbled White - I think you are both right and that is a lesson for me to take more notice of the immediate surroundings! However, is that another egg she is just about to drop (she had been there for quite a while) or is it part of the ovi-posting mechanism? Pity the shot isn't clearer.
Now I know there are some VERY clever folk on this site and I am hoping someone might be able to answer this question. At what point in the life cycle of a butterfly does the metamorphosis from larva to butterfly begin? I had always assumed it was in the pupal stage but I am not sure now and this is the reason why. I have been watching the last remaining Brimstone larva on my little Alder Buckthorn plant and it was quite obvious from the behaviour that it was intending to pupate on the plant (unlike the other half dozen or so). I am sure there must be a technical term for the period just prior to pupation but I don't know what it is. Anyway, I have been taking frequent photos to try to demonstrate what was happening and when the larva was secured by the girdle - still technically a caterpillar? - the photos seemed to show the outline of a butterfly's wings where the front legs are. Please tell me if I am just being fanciful here but it is a serious question. Here's the series of shots anyway:
So, does this complicated process start before the larva has even fully pupated? I hope it is clear enough from these shots - it only seems to be the 2 legs that show wing outlines?