係因為當佢哋受驚嗰陣 ， 佢哋會吸水 然後好似水管一樣發脹 膨脹到佢哋身體體積嘅兩倍 然後攝喺岩石下底 ， 避過獵食者
Because when they are frightened, they suck up water and swell like water pipes to twice the size of their body and then take under the rocks to avoid predators