Assertion: lesser black backed gull | /r/HasProperty | common
Facets:
value: in significant portions
type: DEGREE
value: as about 1900
type: TEMPORAL
Source sentences:
text: In significant portions, common black-backed gulls (L. marinas) were as common as about 1900, but not so much (though not exactly), but some signs show that large herds have learned (taken) about the behavior of herring cheeks in some urban environments.