Aeros' new sounds!

Aeros has been working with making new sounds in the short 3 weeks that I have had him. For those who havent read my other threads about him, is a very young, about 5-6 months old, grey pied cockatiel. He started making an alarm type sound just a few days after getting him, and now within the past week he has been practicing his wolf whistle.
He has the wolf whistle down pat and has started to imitate the whistle I use when I call my dogs. (He hears this whistle at least 4 times a day) And he has mumbled "hello" and "pretty bird" a few times that I know of. Is this a normal learning rate for them or is he just a Genius? He has been very stingy with showing me his talents unless I'm not in the room. Though he did wolf whistle in front of me for the first time this morning while I was feeding him. I was so proud!!!
Once he starts doing it more in front of me I will try to snag a video!

Another 2 new sounds from him just this morning! He is now making kissy noises and laughing!!! I am amazed at the talent of him. He's starting to do it more and more in front of me, so expect a video to come soon!!