The caterpillar carried on for 30 minutes in total -
I was very worried about the one in the middle. It is fascinating how strong their attachment is to the top as the caterpillar was hanging off - so they are able to hold double their body weight.
I have got the clips of the end to show you. He just climbed off and then went walking around the lid. He carried on harassing that poor caterpillar for the rest of the afternoon!