Assertion: ibis's parent | /r/CapableOf | guard the nest
Facets:
value: at night
type: TEMPORAL
value: alternately
type: MANNER
Source sentences:
text: The two parents alternately guard the nest at night, and the bird returning to the nest signals the change of nest guarding duty with a short sequence of calls and an occasional display whereby both partners prod their bills into each other's neck feathers.