Assertion: great black backed gull | /r/HasProperty | common
Facets:
value: around 1900
type: TEMPORAL
Source sentences:
text: The great black-backed gull (L. marinus) was around 1900 as common as the herring gull in the mentioned parts, but has not increased as much (if at all), though some signs indicate the bigger gull has learned (adopted) some of the herring gull's behaviour within urban environments.
text: Bent Life History for the Great Black-backed Gull - the common name and sub-species reflect the nomenclature in use at the time the description was written.