Assertion: captive bred crane | /r/AtLocation | the population
Facets:
value: annually
type: TEMPORAL
value: since 1981
type: TEMPORAL
Source sentences:
text: Since 1981, captive-bred cranes have been annually introduced to the population, and by 1992 it was estimated that 75 to 80 percent of the Mississippi sandhill cranes in the wild in Mississippi had been hatched in captivity.