It's always a risk, I am going to be introducing a new Conure to our home in about two months.
The risk is:
1. They don't get along and now your stuck with two birds that each need their own
cage. You should be ready for this anyway.
2. They do get along and you loss your pet. They want to spend more time with
themselves and they hardly want anytime with you.
3. Breeding. Not a real risk, but if you don't have your bird sexed and you happen to
end up with a male and female and nature takes it's course, can you and are you
ready for that responsibility? Can you give up the babies to new responsible
homes?
From my experience, I have seen birds get along almost instantly and housed in the same cage. This however is in a pet shop environment, so I can not speak for territory disputes. Your first bird might not be so willing to let someone else into his cage that he has had all to himself for a while.
As for yay or nay, it's up too you! Can you take on the responsibility of two birds? If they don't end up liking one another are you ready for the potential problems? Even birds that like each other one day might hate one another the next, but for some reason don't want to be apart, but need to be (This leads to screaming). It's a whole mixed bag of things that could happen.
To me the benefits of two birds outweighs the downside. It beneficial to their health, birds are after all social animals! Out in the wild they have hundreds of their friends to talk to and play with. While in the home caged environment we limit them to themselves when we are at work or away from home. How fair is that to the bird?
Sure they might not want you to handle them as much, but as long as you keep up the handling process they will remain your friend, but be warned that it can become a big issue. Remember, them bounding is a good thing for them, and they might get protective of one another, but its not going to totally break your friendship as long as you work with them. There is always that potential that it can totally break your friendship, but from what I have seen and heard its really rare!
Don't think this will solve any behavior issues (Screaming, Feather Plucking, and so on) because it could double the issue with the one bird teaching the other one their habitats.
So yes it's a risk with many pro's and con's. But for me the pro's outweigh the negatives. We are going to be getting our feathered friend a play mate by the end of November. Even if they don't get along they will still be able to talk to one another in different cages. So it's still a better situation than just leaving our bird to a solitary life. Sure your it's flock, but just like humans you like to do things with your own kind!
Here is another thread on the topic. From a different website.
http://forums.avianavenue.com/bird-...ons-having-multiple-parrots-same-species.html