Organisms capable of rolling locomotion typically achieve this by using their body shape and muscle contractions to roll themselves along a surface. For example, a pill bug, also known as a rollie-pollie, can roll into a tight ball as a defence mechanism. The pill bug's exoskeleton provides a hard exterior to protect its body while it rolls. Similarly, some caterpillars use their flexible bodies to roll themselves into a tight ball as a defence mechanism. Other organisms, such as certain snakes, can use their flexible bodies and muscle contractions to "inch" themselves along in a rolling motion.
spam fails_task pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence