Assertion: horseshoe crab's pair | /r/CapableOf | detect a pair of ventral eyes
Facets:
value: on their undersides
type: LOCATION
value: near their mouths
type: LOCATION
Source sentences:
text: They also have a pair of median eyes that can detect both visible and ultraviolet light, a single endoparietal eye, a pair of simple eyes on top, and a pair of ventral eyes on their undersides near their mouths.