Assertion: american crow's family | /r/HasProperty | polioptilidae
Facets:
Source sentences:
text: The family Polioptilidae is a group of small insectivorous passerine birds containing the gnatcatchers and gnatwrens.
text: The family Polioptilidae is a group of small insectivorous passerine birds containing the gnatcatchers and gnatwrens.