Assertion: gull's food source | /r/CapableOf | be provided by people
Facets:
value: inadvertently
type: MANNER
Source sentences:
text: Bold and conspicuous, black-backed gulls are often attracted to food sources provided inadvertently or deliberately by people.
text: Their numbers have increased enormously in the past century, partially due to their protection from hunters, but also because of the increase in food sources supplied by people.