What is the length range of pill bugs?

Pill bugs, often known as roly-polies, are terrestrial crustaceans that typically exhibit a length range of about 1/4 to 5/8 inches as adults. This size range allows them to be small enough to fit into various habitats yet large enough to be easily observed in their environments. Their size is consistent with their classification and habitat; they thrive in moist environments such as under rocks or logs, which provide shelter from predators and desiccation.

The choice indicating a size range of 1/8 to 1/4 inches is too small for adult pill bugs, as they generally grow larger than that during their life cycle. The ranges of 1/2 to 1 inch and 3/4 to 1 inch also overestimate their typical adult size, making these options inaccurate when considering adult pill bug measurements. Thus, the answer choice identifying the length range of 1/4 to 5/8 inches accurately reflects the size characteristics of pill bugs as commonly found in natural settings.