goose or duck?
I was given a pair of "ducklings," and they have grown to the size of full-grown mallards in the last 2 weeks and now are growing their feathers. They have yellow down and large orange feet and legs, with bills that are a lighter orange. I was beginning to think they might be Embden geese, but they don't have any gray on them.
Refer to the articles on external anatomy for ducks (http://www.extension.org/pages/65370/external-anatomy-of-poultry-kept-on-small-or-backyard-flocks:-d...) and geese (http://www.extension.org/pages/65371/external-anatomy-of-poultry-kept-on-small-or-backyard-flocks:-g...). They may be able to help you identify whether you have a duck or goose.