Assertion: migration | /r/HasProperty | spectacular
Facets:
value: in birds
type: OTHER
value: often
type: DEGREE
Source sentences:
text: In birds, migration is seasonal and often spectacular and much is now known about the physiology as well as the mechanics of migratory flight.
text: In birds, migration is seasonal and often spectacular and much is now known about the physiology as well as the mechanics of migratory flight.