How many offspring can a mallard have?

It really doesn't matter what breed of duck it is. They usually lay up to 8-15 in a nest and in a whole year up to 300 !
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Female mallards lay from 8-12 eggs. They lay one egg a day, then when they have completed laying, they will sit on the eggs to incubate them, this is why all ducklings hatch within hours of each other, ready to follow their mother as a group.Incubation can take approximately 28 days.