Assertion: petrel's family | /r/CapableOf | concentrate on crustacean
Facets:
Source sentences:
text: The diet of many storm petrels species is poorly known owing to difficulties in researching; overall the family is thought to concentrate on crustaceans.
text: The diet of many storm petrels species is poorly known owing to difficulties in researching; overall, the family is thought to concentrate on crustaceans.