- Porcupines have sharp quills that protect them; some are hollow and help them float.
- Sharp, straw-like quills keep porcupines safe and can help them float.
- Hollow quills act like tiny straws—they protect the porcupine and help it float.
Three very short, kid-friendly rephrasings explaining that porcupines have sharp, sometimes hollow quills that protect them and can help them float.