I have 3 OEGB Roos here that are not at all aggressive, a chocolate that is very tame, a self blue that isnt friendly but not aggressive, and an opal that is fairly friendly...THEN I Have a black roo that isnt necessarily aggressive but is psychotic. I am afraid he will kill himself one of these days trying to get away from me, and I had a porcelain roo that was somewhat aggressive. I think its all in how they are raised, and I have heard the blacks can tend to be a little more froggy....