They were mutts from unexpected hatch and given as I don't trust people enough to "rehome" them we processed. I had never cooked duck before and it turned out ok after the 2nd attempt but the processing was gross. They had glands on their tails that I THOUGHT were part of the "drake" feathers but looking up diagrams it now looks like a "preening" gland???? Had thick yellow ooze coming out. ICH! Does anyone know what that is definitively?