Assertion: martial eagle | /r/CapableOf | drop in the mid-20th century
Facets:
value: to fewer than 500
type: OTHER
value: from about 1,500
type: TEMPORAL
value: by the 1990s
type: TEMPORAL
Source sentences:
text: As a regional example of their decline: in the former Transvaal Province of South Africa, the total estimated martial eagles present dropped from about 1,500 in the mid-20th century to fewer than 500 by the 1990s.