Assertion: monarch | /r/CapableOf | come under intense scientific scrutiny
Facets:
value: for more than a century
type: TEMPORAL
value: because of dwindling population
type: CAUSE
value: because of their migration habits
type: CAUSE
Source sentences:
text: For more than a century, monarch butterflies (Danaus plexippus) have come under intense scientific scrutiny, mostly because of their migration habits and dwindling population.