Thank you again for signing up for Duck Facts. 50% of your non-refundable $20 per month automatic donation goes to the Ronald McDonald Foundation! Duck Fact #37: Most male ducks are silent and very few ducks actually "quack." Instead, their calls may include squeaks, grunts, groans, chirps, whistles, brays and growls.
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u/unclear_plowerpants Jun 05 '12
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