When Nancy and I were in Nanaimo, I took some photos of a web of caterpillars that were on a bush alongside the path we were on. More recently, we were up near Bembridge windmill on the Isle of Wight so I could take some photos of the windmill as the evening sun was lighting it up. As I walked back to the car, I could see something in the hedges and went to take a look. Tuns out it was the same thing. Seeing such a dense cluster of caterpillars is a touch surprising and I would have spent longer checking them out but the others were waiting for me, so I made it quick.