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You cannot tell a gender of a mallard duck when they are ducklings. When they enter their "teenage" years, they start getting markings. Male's head's start getting dark and they get colorful feathers on their tail. Females don't change much they get a blue stripe on their wings. See Related links to see what a male mallard looks like.

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Q: How do you tell the sex of a 3 week old mallord duck?
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