Assertion: region | /r/HasProperty | thronged by grassland birds
Facets:
value: like greater sage grouse
type: OTHER
value: like mountain plover
type: OTHER
Source sentences:
text: When there were fewer human encroachments in the Great Plains, the region was thronged by bison, black-footed ferrets, pronghorn antelope and grassland birds like greater sage grouse and mountain plover.