No, I have no duck-specific sources in my research, but as far as I know, ducks have the same respiratory features that make chickens and other birds so susceptible to the products of polytetrafluoroethylene-based coatings. You bring up a good point, though! I've been thinking of doing some more in-depth research on avian respiratory symptoms, and a comparison of various species such as ducks and chickens would be a worthwhile addition.
Pretty sure that I've read that smaller birds, like finches, parakeets, etc, are most susceptible, probably because of their size, its going to take less to kill them. But I would definitely be interested in what can be found.. Thanks!