Assertion: pigeon | /r/ObjectUse | used as message carriers
Facets:
value: for over 5,000 years
type: TEMPORAL
value: most commonly
type: DEGREE
Source sentences:
text: Pigeons were most commonly used as message carriers and the role that the birds played in the Intelligence Service cannot be underestimated.
text: Pigeons have been used as message carriers for over 5,000 years.