Enlarge (credit: grass-lifeisgood) Social insects, which don't have very large nervous systems, are capable of remarkably sophisticated behavior, such as the direction-giving dance by bees or the lifesaving rafts formed by fire ants. In these cases, the benefits of this behavior—more food or survival, respectively—are pretty obvious. But there are also cases where the benefits are less than obvious, so how do insects collectively decide to engage in a risky activity? Researchers are studying a species of ant, the weaver ant Oecophylla smaragdina, that can move vertically amid trees by building a ladder using its own body.