In order to withstand tidal currents, juvenile horseshoecrabs frequently burrow in the sand.
为了抵御潮汐，幼年马蹄蟹经常在沙子里挖洞。
2
For different individual horseshoecrabs, the circadian period ranged from 22.2 to 25.5 hours.
对于不同的鲎来说，其生理节奏的周期范围在22.2小时到25.5小时之间。
3
Surprisingly, in areas where tidal currents are very weak, juvenile horseshoecrabs are found not to have significant barnacle populations, even though they seldom burrow.