by Shani » Mon Oct 25, 2010 3:28 pm
I've actually heard that budgies can be quite aggressive towards cockatiels. Cockatiels (generally speaking) are very placid, timid birds compared to some of the more aggressive smaller parrots (in uh... inter-parrot relations anyway) That's based on word of mouth though, not personal experience.
I think what's probably the biggest factor in having different species coexisting in aviculture is largely how the birds are introduced to each other/taught to interact with one another, and not so much on how closely the two parrots are related to each other genus/tribe wise. Like, if you had two parrots and you just lumped them in a cage together without warning - chances are that, regardless of how closely related they are to each other, they wouldn't get along. However, if you introduced them in a neutral sort of territory, and let them get acquainted with each other over time,then I don't think there would be much of a problem.
Anyway, I would hazard a guess that due to parrots of the same genus/tribe being more closely related to each other they would be more inclined to get along with each other due to similar mannerisms etc. That said, I would be more comfortable putting two or more parrots in an aviary/cage setting together if I knew they were a very passive species by nature (even if they weren't remotely related by genus/tribe), than i would putting two closely related (eg: same genus) yet aggressive parrots together.
I'd definitely err on the side of caution though, and probably lean towards giving each species their own section of an aviary unless the two species have often been kept together without problems over a long period of time. Princess parrots and neophemas are often housed together in Australian aviaries, for example (though even this is debated as to whether it's a good idea or not).