Assertion: tuatara's eye | /r/CapableOf | act as light sensor
Facets:
Source sentences:
text: The reptile can’t actually see out of it, but the “eye” may act as a light sensor, telling the animal how much time to spend in the sun.
text: Some biologists (people who study living organisms) believe the eye may function as a light sensor, determining how much time the tuatara spends basking in sunlight.