There was a strange moment when we realized that we were surrounded by thousands of caterpillars. They were everywhere. While we reacted with the kind of curiosity that can only be bred through hours of watching the Discovery Channel, a group of Japanese tourists actually fled in sheer terror. Several members of the group were actually crying histerically in fear. I wish I had a video camera for that moment.
I have no idea if the nearby butterflies were related, but they were also pretty impressive.