Assertion: manatee's population | /r/CapableOf | decline by more than 20 percent
Facets:
value: over about 40 years
type: TEMPORAL
value: over the next two generations
type: TEMPORAL
Source sentences:
text: The Florida manatee and the Antillean manatee were listed as endangered in 1967 and 1970, respectively, under the Endangered Species Preservation Act of 1966; the number of mature individuals was estimated to be fewer than 2,500 for each subspecies, and the populations were expected to decline by more than 20 percent over the next two generations, or about 40 years.