Cockatiel Tulip Whistles to his Bird Friend Cloud

I just love this video of Tulip the Cockatiel whistling to his Cockatiel friend named Cloud. At one point Tulip seems disappointed that Cloud is not interested. (LOL)

[youtube=http://www.youtube.com/v/Ar23IiTYEhU?version=3&hl=en_US&rel=0]