Assertion: mallard's speculum | /r/HasProperty | visible
Facets:
value: often
type: DEGREE
value: in flight
type: TEMPORAL
value: to varying degrees
type: OTHER
Source sentences:
text: All mallards have a blue speculum that is visible when the birds are in flight.
text: The speculum is often visible to varying degrees when the bird is at rest.
text: A purpish-blue speculum is often visible, especially in flight.