Assertion: wood bison | /r/HasProperty | extinct
Facets:
value: completely
type: DEGREE
value: by the 1940s
type: TEMPORAL
Source sentences:
text: These bison were not only infected with brucellosis and tuberculosis, which infected the wood bison herd, but the wood and plains subspecies also interbred, and thus it was thought that wood bison were completely extinct by the 1940s.