This ia a forum, an opinion was asked for, an opinion was given. Exactly how do you disprove an opinion? I didnt realize an opinion had to come with references. I'll cite my thoughts next time, it might make it easier to find out if its scientific fact. Since when was behavior even able to be truly predicted.
Um, I thought I was stating MY opinion.
Opinions don't need to come with references, although I find them more convincing when they come with arguments. Things stated as fact, however, I personally don't accept as fact unless there are references. And Dr. Van Sant was, admittedly via hearsay, apparently stating things as facts, not as opinions. It was specifically her assertions which I was attempting to rebut.
At any rate, I wasn't trying to give anyone here a hard time, just explain my own reasoning.
I guess I agree that if you plan to have a household with flighted birds free to mingle and allowed to do so without supervision, that having birds of the same species would hedge your bets in favor of compatibility. OTOH, I have a hard time accepting that budgies and cockatoos would be more compatible than budgies and Amazons simply because they happen to come from the same continent initially. MHO.