Which of the following does a pillbug do that a sowbug does not?

The ability to roll into a ball is a distinctive behavior that characterizes pillbugs and differentiates them from sowbugs. Pillbugs, which belong to the order Isopoda, have a unique adaptation that allows them to roll up when threatened, providing a defensive mechanism against predators. This behavior is made possible due to their rigid exoskeleton and the structure of their body segments that allow for this rolling action.

Sowbugs, in contrast, are also members of the isopod family but do not possess this rolling ability. This distinction is crucial for identification purposes in the field of pest control and entomology. Understanding these behavioral traits helps pest control professionals make informed decisions during inspections and control measures, as the presence of a pillbug versus a sowbug can indicate different environmental conditions or management needs.