Assertion: grouse's number | /r/CapableOf | decline to 120–200 birds
Facets:
value: by 1890
type: TEMPORAL
Source sentences:
text: There were about 300 left on the island of Martha's Vineyard, off Massachusetts, but by 1890 this number had declined to 120–200 birds, mainly due to predation by feral cats and poaching.