Assertion: duck's eye | /r/CapableOf | remain open
Facets:
value: often
type: TEMPORAL
Source sentences:
text: The data demonstrated that ducks can allow half of their brain to sleep at a time, so that the other half of their brain -- and the associated eye, which often remains open -- can be alert for predators.
text: Ducks sleeping at the end of a line often keep the eye closest to the other ducks closed, while the other eye remains open.