Assertion: hawk's size | /r/HasProperty | around 20 g
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Source sentences:
text: The more numerous native passerines, such as northern cardinals (Cardinalis cardinalis) and northern mockingbirds (Mimus polyglottos), have good reason to fear these hawks as they are widely and regularly taken as are even common birds of less than half their size (around 20 g (0.71 oz)), such as song sparrows (Melospiza melodia), dark-eyed juncos (Junco hiemalis) and house finches (Haemorhous mexicanus).