Hi William, and welcome to Project Noah! There are quite a few differences between ducks and geese. You can find out more here:
http://scienceray.com/biology/what-is-the-difference-between-a-duck-and-a-goose/
Also, the scientific name for your mallard duck is Anas platyrhynchos. You can add it to your spotting by clicking on Edit this spotting and then saving changes.
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