we have a medium sulfur crested cockatoo. we've had it for about 3-4 years now. when we first got him/her, the parrot picked up a few words, calls our dog, barks like our dog and says it's own name. but the parrot hasn't learned anything new now for a long time. do they stop learning new things at a certain age? i say good morning to him/her every day hoping that the bird would say it, but it's not happening.

