Join Date: Nov 2009
Location: Indiana, USA
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I really can't advise. I do have two birds of two different species sharing a cage, the bourkes and the linnie. I wouldn't even recommend this with most linnies, but my linnie wanted to be with the bourkes so badly that we let her have her wish. She is an exceptionally gentle linnie.
I think sun conures and cockatiels have more size difference than linnies and bourkes, but I do not know that for certain. Stanley only weighs 2 grams less than Elisa. I think the beaks of sun conures are much more powerful than the beaks of cockatiels, but, again, I do not know that for certain. Elisa's beak IS more powerful than Stanley's. She destroys toys that Stanley doesn't. She could seriously injure, probably kill Stanley if she wanted to. However, she is very sweet with her.
I just dont' know enough about the size and beak strength of either bird to advise. There are folks on here with both.
I will say this, though. If the birds have a great deal of out of cage time together, I do not think it is cruel to keep them caged separately when you are not around. I believe, from the descriptions that you give of the amount of time your birds have out of their cages, that they get enough socialization to be content even without being caged together. If there is ANY possibility that leaving them together in a cage while you are out of the room could result in serious injury, I would advise leaving things the way they are. Your birds have you, and they have one another. They are not under-stimulated.