But we collect butterflies in places where no human has been before. Once we had to hire a helicopter to help us to access to the mountain. So the helicopter came, dropped us from a height and left us for a week. This collection is impossible to replace. I've been here five years, and there are drawers that I haven't seen before. Setting butterflies definitely is something therapeutic thing to do. It is a dying art, because not many people can do it any more. Just doing the antennas. This is one of the tricky bits. If the antenna breaks, that's a big problem because you can't fix it. A butterfly collected today will look exactly the same as one someone collected 250 years ago. And here you are.