Fiddler crabs that are kept in laboratory tanks,away from both sunlight and the wash of tides,still carry on their daily cycles of adivity and rest.

• 只管大阳照不到它们、放在买验室水槽里的招潮蟹、虽然远离大阳光和潮水的冲击，仍然进行着每天活动和休息的交替。