Well, actually, the current minhag of ashkenazim according to the rema is to require a mesorah on birds. So no, even if we found another bird with the precise same set of properties (simanim, which are listed in the shulchan aruch), we could not eat it.
OK, so then for Ashkenazim, we’re back to the turkey question and your previous favorite answer doesn’t really help then. So, again, how can you have a mesorah about something that you never knew existed?
The Wolf