Assertion: swan's population | /r/HasProperty | stable
Facets:
value: between 2006
type: TEMPORAL
value: between 2015
type: TEMPORAL
Source sentences:
text: Black swans were introduced to various countries as an ornamental bird in the 1800s, but have escaped and formed stable populations.
text: Black swans were introduced to various countries as an ornamental bird in the 1800s, but have escaped and formed stable populations.
text: The population is stable and not severely fragmented.
text: Their numbers fluctuate annually, particularly in the western breeding population, but overall populations were stable between 2006 and 2015.