Assertion: petrel's nest | /r/HasProperty | shallow burrow
Facets:
Source sentences:
text: The nest is a shallow burrow or old rabbit tunnel up to 140 cm (55 in) long in thick soil on vegetated ledges.
text: The nest is a shallow scrape lined with pebbles, placed in rock crevice, small cave, or on snow-free rocky ledge with overhanging protection.