Assertion: trumpeter swan | /r/CapableOf | treat as a subspecies of it
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: Very similar to the whooper swan (and sometimes treated as a subspecies of it), it was hunted almost to extinction but has since recovered Tundra swan, Cygnus columbianus breeds on the arctic tundra and winters in more temperate regions of Eurasia and North America.
text: Very similar to the Whooper Swan (and sometimes treated as a subspecies of it), it was hunted almost to extinction but has since recovered.