Assertion: passenger pigeon | /r/HasProperty | the most common bird
Facets:
value: in north america
type: LOCATION
value: on earth
type: LOCATION
value: in its heyday
type: TEMPORAL
Source sentences:
text: The passenger pigeon (Ectopistes migratorius) or wild pigeon was a species of pigeon that was once the most common bird in North America.
text: It may have been the most numerous bird on earth in its heyday, and A. W. Schorger believed it accounted for between 25 and 40 percent of the total landbird population in the US.
text: As recently as 1850, passenger pigeons were the most abundant bird in North America, and possibly even the world, with billions of birds alive in the early nineteenth century.
text: The passenger pigeon was a species of pigeon that was once the most common bird in North America.
text: Estimated to have numbered three to five billion at the height of its population, it may have been the most numerous bird on Earth; researcher Arlie W. Schorger believed that it accounted for between 25 and 40 percent of the total land bird population in the United States.