Assertion: nilgai's population | /r/HasProperty | migratory
Facets:
value: mostly
type: DEGREE
value: in the serengeti and tarangire ecosystems
type: LOCATION
Source sentences:
text: In the Serengeti and Tarangire ecosystems, populations are mostly migratory, with herds consisting of both sexes frequently moving, but resident subpopulations also exist.