Assertion: horseshoe crab | /r/CapableOf | maintain circadian rhythm
Facets:
Source sentences:
text: In addition to the 7 eyes on the shell, there are also a series of photoreceptors (i.e. light sensors) on the telson that helps the horseshoe crab maintain a circadian rhythm (i.e. day and night cycles), as well as two ventral eyes located near the mouth to assist in swimming and perhaps hunting efficiency.