I have baby ducks growing very fast and are huge already bit I don't know what they are?

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Thanks for your help

 

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One is bigger and more aggressive, he also has chubby cheeks is he maybe a male? Plus he has got the most adult feathers out of the three of them

 

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He are black with a fade shiny green but the yellowest chick has black with brownish red couler on the end

 

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See the feather