That's been my simple point the entire time too Shawn.
Honestly I could care less about who wrote what, that honestly dont mean squat. Have they ever made it happen in the real world is the question?
The answer is no. This has been debated all over the world and is on about every poultry forum out there. Yes, anything is possible, BUT stop talking about it and just simply show me one. You cant or you already would have over a year ago when we first had this discussion. All I keep hearing is so and so wrote this about it, or this guys paper says...and you yourself have stated many time that Joe Blow wrote a paper that is incorrect, some one else proved them wrong, now this guys paper is the best and most accurate, etc etc that honestly is pointless.... just show me one is all I ask.
I base my statement off personal experience with them for many years, as well as all the fellow breeders who have the same real world hands on breedings with them in mass community pens of mixed species. With thousands upon thousands of mandarins in people hands now a days, it would be fairly common to see. This isnt a rare species thats hard to find. Virtually every waterfowl keeper has mandarins, and I would dare say 99% of them are kept in mixed species community pens. Come to think of it. I have never seen a collection with just mandarins in it aside from the few that just only have mandarins.
Science is based on proving theories, my proof is this fact. With the mass scale of birds in captivity and the sheer absence of any documentation (photo evidence) of any form of hybrid from them, thus I conclude it just isnt physically possible. Call it a chromosome, or whatever, I really dont care. For some reason known only to God I guess, mandarins just dont hybridize. With all the birds bred over the years, It would have popped up countless time by now just like it has in all the other species.
For decades, it's been said to be caused by the number of chromosomes they have. This may or may not be true, again dont care. The fact is, there is something about their genetics that prevents cross fertilization from any other species.
Show me some hard facts, not just throw around names of people who wrote stuff, any one can do that, and we can go further into it. Personally, I'd love to see one, should make for an extremely unique bird.