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
Surprisingly, in areas where tidal currents are very weak, juvenile horseshoecrabs are found not to have significant barnacle populations, even though they seldom burrow.
令人惊讶的是，在潮汐流很弱的地方，幼年马蹄蟹的藤壶数量并不多，尽管它们很少在洞里活动。
3
For different individual horseshoecrabs, the circadian period ranged from 22.2 to 25.5 hours.