By contraction of various parts of the panniculus carnosus , the Short-beaked ORGANIZATION@1 can change shape -- the most characteristic shape change is achieved by rolling itself into a ball when threatened , protecting its belly and presenting a defensive array of sharp spines .

By contraction of various parts of this muscle the MISC@1 can change shape -- the most characteristic shape change is achieved by rolling itself into a ball when threatened , protecting its belly and presenting a defensive array of sharp spines .
