Assertion: tawny owl's egg | /r/CapableOf | weigh about 47 g
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Source sentences:
text: Egg sizes are usually between 46.5 and 52.3 mm (1.83 and 2.06 in) in height by 39 to 44 mm (1.5 to 1.7 in) in diameter, and the eggs weighing on average about 47 g (1.7 oz) when fresh.