I know with Ringneck and Diamond Doves, there comes a time when the males of breeding pairs want those grown up babies OUT of the cage. This usually happens when the female is sitting on new eggs or the new babies just hatched. In both cases, I had my doves in cages rather than aviaries. But my Green Singers are only in a large cage also, so there won't be anywhere for this baby to go if his father starts getting aggressive. I guess I could throw him in with my non-breeding Gouldian pair temporarily?
My Green Singing Finches cage (current has mother, father, and baby):
