. Therefore, those two are housed separate in an aviary, as Siggi relentlessly attacks all other birds. However, when Gonzo, because of an egg binding surgery, was not here for 2 days, his behavior changed dramatically. His aggression faded into thin air completely, I could even let him stay in the other aviary, but because he even allowed himself to flirt with Tonto, one of the other hens, I had to take him back out of there. As soon as Gonzo came back home, the rascal was up to his old tricks again. Why they all peacefully coexist with us, I can not say.  Perhaps its because all the newbies are introduced straight into the community aviary (under strict supervision) and therefore creates no territorial behavior or that bonded couples have already been formed in there. 

All pure speculation. They are even quite peaceful when an egg is laid now and then, as was two times the case with Carina. Siggi and Gonzo were separated from the others from the start, because we were afraid the other red crowns would attack him because of his disability 
(exactly the opposite happened) Would he have acted more friendly if we would have placed him in the big aviary with the others from the start? I don't know...