My hazy recollection was that the hybrids-enabled CV model was suggesting Mallard x American Black Duck for every Mallard and American Black Duck. Which I guess makes sense since the hybrids, accounting for backcrosses, cover a spectrum of phenotypes between the two species. But it’s kind of misleading because hybrids are much less common than either pure species.
Would there not be similar issues with plants?
In my area there would be multiple observations of all three taxa so I think the CV would have high confidence “Visually Similar / Expected Nearby” for both the species and hybrid (not sure if the new geomodel changes how the nearby part works). I wonder if accounting for the ratios of number of observations in a way similar to this proposal would help with that. For my county the ratio of observations for Mallard:hybrid:American Black Duck is 762:18:102.