Assertion: tawny owl | /r/HasProperty | preyed upon an adult mallard
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Source sentences:
text: In at least one case, a tawny owl preyed upon an adult mallard (Anas platyrhynchos), which, at a mean weight of around 1,060 g (2.34 lb), is about twice a tawny owl's size and possibly the largest prey known to be tackled by the species.