Assertion: billed woodpecker | /r/HasProperty | holy grail bird
Facets:
value: because of its rarity
type: CAUSE
value: sometimes
type: TEMPORAL
value: because of elusiveness
type: CAUSE
Source sentences:
text: The ivory-billed woodpecker is sometimes referred to as the "holy grail bird" (because of its rarity and elusiveness) and the "Lord God bird" or the "Good God bird" (both based on the exclamations of awed onlookers).