Hey everyone, regarding a new addition to a flock, I've had the same consideration. Although I fluctuate between Amazon, Macaw, Uncaps, or Ruppell's parrots, I have to be honest, the thought of whether my birds will get along never really crossed my mind. -- NOW before you go ahead and judge me
I guess I've been a bit "lucky" on the cohesion of my flock despite a loss last year and a new introduction this year.
I originally started with 2 fisher's lovebirds from a pet store, when the female died from getting tangled in a towel string after escaping out of the cage, then I got a budgie (who ended up being a female) for my male lovebird Daniel. Then, about 1 year later I got my GCC Casey when she was 3 1/2 months old. They all got along, and I do not ever recall any hardships or fights between these 3 birds, or between Daniel and my budgie Sammy (except for obvious occasional squabbles as they were cage mates). When Sammy passed away last year, I thought long and hard about whether or not I should get another budgie for Daniel, as he is a "don't touch me" bird -- but a few months went by and Daniel + Casey were getting along, and they were always in separate cages before, but at one point, I put them together because they were always preening each other. But I made my decision to introduce my now almost 1 year old budgie Nigel when Casey started plucking Daniel's neck feathers! So introduction of Nigel was a bit rough, as he is a boy and Daniel is a boy, they initially attacked each other, and that is why I assume Nigel sort of dislikes Daniel sometimes. But I moved them to a neutral space (my room) side by side (separate cages) for about 3 weeks, and they were much better. Now they stay in the same cage, with Casey in another cage; but Nigel has an attachment to Casey, and perhaps sees her as a "mother" figure, but Casey doesn't seem interested. They are all out playing together at least 4 hours a day.
My point for that biography of my flock is that I think to introduce a young bird to the flock, introducing the birds and have them interact in a NEUTRAL space, and perhaps a good mix of both sexes. I'm not sure if birds of different species cross-continentally know whether the other is a male or female (that may be left to the animal cognitive psychologists) but maybe they have a clue... Hmm
When I do get another bird, I realize now that it would be better for me to get a female vs. a male to balance out my uneven gender differences, and I always wondered if Daniel would have been less aggressive had I got a female budgie the second time instead? --- Therefore, steps taken to guide a flock in good socialization is key.
For example: if you have a parrot that was not hand raised properly with proper socialization, or you receive a baby bird that was not properly raised, there will most definitely fights between birds. Certain critical periods in a chick's development as well as nurturing, if missed will have detrimental consequences to socialization that are out of our control which will affect how current and future birds will get along.
Obviously young birds tend to get along better, and I've seen baby
and
play together, baby
and
play together, pionus and
together. And ofcourse my flock of South American
, African
and Australian
birds play together joyfully
and their age gap is quite dramatic with the youngest being less than 1 year, and oldest being 9.
As for
s, I kind of agree that they've got a lot of personality, and I do hear often that they don't do well with other birds -- but that is still debatable (as personally, they are probably THE most successful parrots in the world because they have no reliance on nest sites, and adapt will to a variety of environments!). As well, Alexandrians and Indian Ringnecks are quite good at keeping to themselves, same with Pionus parrots, BUT I once had a baby black headed caique about 4 months stand next to an Alex baby 5 months, together for about 1 hour on top of a cage while I was getting their own spaces ready, and they got along just fine without ever meeting each other before. I also don't believe size is a big problem, BUT safety wise it may be, as a budgie paired with a macaw is probably quite dangerous, some Amazons cuddle up nicely to smaller birds!
I wish you the best of luck pairing your future flock! I hope I've been somewhat helpful!
Cheers!