Assertion: callery pear | /r/HasProperty | excellent roosting tree
Facets:
value: due to its dense structure
type: CAUSE
value: for starlings
type: PURPOSE
value: for gregarious blackbirds
type: TRANSITIVE-OBJECT
value: for grackles
type: PURPOSE
Source sentences:
text: Due to its dense structure, callery pear is an excellent roosting tree for gregarious blackbirds, grackles and starlings, which are problematic in urban areas due to defecation on cars and sidewalks and human health concerns.