4 or 5, as long as they are Kirin Parrots and not SB Flowerhorn you don't have much to worry about.
[video=youtube;6SHz1-PFUq8]http://www.youtube.com/watch?feature=player_embedded&v=6SHz1-PFUq8[/video]
[video=youtube;6SHz1-PFUq8]http://www.youtube.com/watch?feature=player_embedded&v=6SHz1-PFUq8[/video]