i don't think that using the ducks from the dock pond to create adoptable ones will be possible because they do not have as many files as the regular adoptive species do.
have you actually checked one of the most 'popular' designers birds and how many animations they have? Or some other user created downloads such as snakes?
I don't blame them though, I've designed myself and have practically never made anything animated, just because it requires too much animations. The only person I've known that has really succeeded, is Tasmanian Tiger.