OMG!
Just googled 'nymph parrot' and it brought up loads and loads of cockatiels....well I never. You learn something new every day.
Iiusia 'tiels (as I know them) are flock birds. There could certainly be three in an aviary! But for a cage, the cage would have to be pretty massive. Are the birds young? Are the used to being together? What is the back story?
A crossover Quaker Scuti (F), A Sun conure named AC, A Cinnamon Green Cheek conure Kent, and 6 budgies, Scuti Jr. (f), yellow (m), clark Jr. (m), Dot (f), Zebra(f), Machine (m).
Amen to that. I am currently dealing with a maturing male.
I have 4 cockatiels in one cage (all girls) and 2 cages with 2 males in each.
I just recommend that there be one food dish for each bird in a cage. When one bird starts to eat the other birds want to eat at the same time. IF there are not enough "feeding stations" fights can develop.
I have two male tiels and they really hate each other. 'Nut (who is the boss) will chase my other tiel around growling and screeching at him LOL... but so long as the cage is a decent size everything's perfectly just fine with NO issues at all... but if in a tiny 17 inch cage it's a little too closed in. In other words... they need some space LOL