Assertion: muscovy duck | /r/HasProperty | migratory
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: It has been noted that the Muscovy duck is non-migratory, and both the Pekin and the mulard hybrid cannot fly.
text: Most mallard ducks are migratory birds, flying south to temperate climates during the winter, and northwards in the summer to nesting grounds.
text: Domestic ducks (including the Pekin) are derived from the mallard duck, which is sometimes migratory and sometimes not.