Assertion: female mallard duck | /r/CapableOf | make classic quacksound
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text: Female mallard ducks (as well as several other species in the genus Anas, such as the American and Pacific black ducks) make the classic "quack" sound while males make a similar but raspier sound that is sometimes written as "breeeeze",[self-published source?]
text: Female mallard ducks make the classic "quack" sound while males make a similar but raspier sound that is sometimes written as "breeeeze", but despite widespread misconceptions, most species of duck do not "quack".