So far, no caterpillars from butterflies or moths attacks my succulents. But, my greatest enemy were the snails..sneaky monsters! They used to favor soft leaved new growth of my other regular plants but this past Fall and Winter, they have learned to attack my euphorbias, plumerias and other smaller succulents. If not for the cacti's spines pretty sure they would have devoured it too. Thankfully these succulents are recovering now slowly and being dry weather, the slimy monsters are away.