Assertion: cockatoo's population | /r/CapableOf | decline in 19th and early 20th centuries
Facets:
value: drastically
type: MANNER
Source sentences:
text: Once widespread and abundant, the population declined drastically in the 19th and early 20th centuries with the removal of most of its native habitat; the species completely vanished from Vieques and Mona Island, nearby to the main island of Puerto Rico.