Assertion: gull's nest | /r/HasProperty | made on small platform
Facets:
value: on a cliff
type: LOCATION
value: by covering the rocky ground
type: MANNER
Source sentences:
text: The nest is made on a small platform on a cliff, usually less than 10 m above sea level, by covering the rocky ground with small pieces of lava, white coral, and sea urchin spines, which prevent the egg from rolling.