My 4 month old Grey (Charlie) has been with us a week now. We have a 8 or 9 month old cockatiel (Enzo)for 4 month now. He is clearly a bit jealous of Charlie. I was a bit nervous having them close to each other but today Charlie jumped off his perch to the carpeted floor and Enzo walked right over to him with no fear of the larger bird and they just sort of stared at each other for a few minutes with not much of a reaction from either. Enzo typically chirps and carries on daily, and Charlie could care less. Neither have exhibited aggressive behavior other than Enzo wanting attention when we are playing with Charlie. Enzo is a male and we are waiting to see this week if Charlie is a male by DNA testing, if that helps...
Demetri