Assertion: birdhouse | /r/HasProperty | left up year round
Facets:
value: for use as roosting sites
type: PURPOSE
value: as winter shelter for migratory birds
type: PURPOSE
Source sentences:
text: If possible, birdhouses should be left up year round for use as roosting sites or as winter shelter for migratory birds, however, they can be taken down, cleaned, and put back up after nesting season is over.