Assertion: petrel's burrow | /r/HasProperty | covered with small rocks
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: One white egg is laid in a burrow in turf or soft soil that is usually covered with vegetation, feathers, or small rocks.
text: One white egg is laid in a burrow in turf or soft soil that's usually covered with vegetation, feathers, or small rocks.