While hacking back the topgrowth of the ivy on the wall at the bottom of my garden, so I can see what I'm doing while I remove as much as I can, I had a butterfly whizzing round my head for a few minutes. Either a Red Admiral or a Small Tortoiseshell, I think, as I was so surprised as I saw none near here last year, and consider April early for butterflies in Northeast Scotland anyway, that I didn't get a proper look at it, other than to say "Gosh, a butterfly" Then I had a thought that it might have been overwintering in the ivy (so not a Red Admiral), and I had a vague recollection of reading about this years ago. So I stopped attacking the ivy, and came in to look at the books. No luck. Do butterflies overwinter in ivy thickets?