Assertion: blackberry's fruit | /r/HasProperty | important source of food
Facets:
value: for many upland gamebirds
type: TRANSITIVE-OBJECT
value: for songbirds
type: TRANSITIVE-OBJECT
Source sentences:
text: The fruits of these woody plants (Rubus spp.) are an important source of food for many upland gamebirds and songbirds (see the Bird Table).