Stupidity: When Thang, Rose and Didi tell Josephine they will help her build a new ant hill, she decides that she does not need her wings anymore and proceeds to break them by stomping on them. This decision was completely illogical as she has no idea if her wings will be useful in future. She could have easily just stopped using them. (00:04:20)
Stupidity: Just after the geckos have finished eating Josephine's children, Thang, Rose, Didi and Sal attempt to sneak away. They attempt to sneak away from the geckos by walking directly in front of them which results in the geckos spotting them. If they attempted to get away in literally any other direction, the geckos would not have seen them. (00:22:50)