Assertion: trumpeter swan | /r/HasProperty | extirpated in lower 48 states
Facets:
value: due to habitat
type: CAUSE
value: nearly
type: DEGREE
value: by 1930
type: TEMPORAL
Source sentences:
text: Although they once nested from Alaska to northern Missouri, trumpeter swans were nearly extirpated in the lower 48 states by 1930 due to habitat loss and hunting.