Assertion: hainan gibbon | /r/CapableOf | undergo severe decline
Facets:
value: in the late twentieth century
type: TEMPORAL
Source sentences:
text: Once numbering around 2,000 individuals in the 1950s, the Hainan gibbon underwent a severe decline in the late twentieth century due to habitat loss and hunting, and is now one of the most threatened species in the world, with only an estimated 28 individuals remaining.