Our caterpillars are doing great! They are quite still at the moment and only move when they feel safe. They are very sensitive to things above them as their natural instinct is make themselves less visible to birds and other animals that may want to eat them.
All 5 caterpillars are spinning webs for themselves. This is normal behaviour and they will continue to do this until they are ready to pupate. You may also see some small, spiky balls in the container. This is their exoskeletons which they are shedding. They need to shed up to a couple of times a week as their growth is so rapid.