mallard ducks have a 1 m wingspan and weigh 2 kg, so by my calculations a horse-sized duck would have a 500 m wingspan
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Replying to @joedrew
@joedrew Are you accounting for the weight being proportional to the cube of the wingspan? (But strength to the square!)

Sep 15, 2012 · 2:44 AM UTC

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Replying to @davidbaron
@davidbaron you have clearly studied horse-sized ducks more than I. :-)
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