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would love to see pics of them. I'm no geneticist, but it is common knowledge among breeders that there is some oddity in the chromosome number of them that prevent hybrid mandarins. I have read the reports listed above, well some of them, most were dated back in the mid 1900's, no a real scientific time, and largely based on speculation and guessing what this hybrid could be.
In most all cases, thought of mandarin hybrids always end up be honestly a wood duck hybrid.
The wood duck and mandarin are the only two species of duck in the genus AIX , so logic would say if a hybrid were to occur, it would be between those 2 species, yet there are no known photos world wide of such a hybrid bird, and Lord knows there are a blue million mandarins and wood ducks penned together across the world.
So to say it is genetically impossible is well pretty much spot on. We all know as soon as you say impossible though, someone will prove you wrong....in this case, I would love to see the photographic proof as would thousands of other fellow waterfowlers.
In most all captive cases, mandarins are almost always kept in a group community pen, so there are countless chances for them to happen that's for sure. Yet to date, I have never once seen one that was truly PROVEN to be a mandarin crossing.
There have been reports of mallard, wood duck, merganser, pintail, gadwall, red heads and even pochard crosses with mandarins, but when it come down to picture proof time, either photos were not provided conveniently, or it was an obvious wood duck hybrid in all cases I have seen or read about.