We have Sammy, the baby, and an 4 yo White-winged parakeet, Lady. It's a pretty substantial size difference. We haven't let them interact yet, although I have taken Sammy closer to Lady a few times to let him watch her taking treats/nuts from our fingers.
Eclectus, CAG, BH Pionus, Maximilian’s Pionus, Quakers, Indian Ringnecks, Green Cheeked Conures, Black Capped Conures, Cockatiels, Lovebirds, Budgies, Canaries, Diamond Doves, Zebra Finches, Society F