Assertion: otter's population | /r/HasProperty | extirpated
Facets:
value: during the twentieth century
type: TEMPORAL
Source sentences:
text: The North American river otter (Lontra canadensis) was widely distributed from the Rio Grande northwards but many populations were extirpated during the twentieth century, it now being considered rare in 15 states of the United States, though still widely distributed in Canada (Figure 6).