Assertion: canvasback's food | /r/HasProperty | obtained by hunting
Facets:
Source sentences:
text: Kleptoparasitism is thought to be a supplement to food obtained by hunting, rather than a significant part of any species' diet; a study of great frigatebirds stealing from masked boobies estimated that the frigatebirds stole at most 40% of their food and on average stole only 5%.