Even without daylight the crab's skin colour continued to change exactly on time. 即使沒有陽光,招潮蟹的皮膚仍可以變換顏色。
But when an enterprising scientist placed a fiddler crab in darkness,he was amazed to find that the color of the crab's shell kept ticking off the time with the same accuracy. 但是,當一個勇於探索的科學家把招潮蟹放在黑暗中,他驚訝的發現蟹殼的顏色依然準確的按時間轉變。