Fiddler crabs that are kept in laboratory tanks, away fromboth 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。