Absolutely fascinating on all levels, and as entertaining as it is, there's a level of sadness about it, too, when the bird imitates the sounds of it's habitat being destroyed.
Edited to correct spelling error... habit into habitat
That reminds me of the guy in the "Police Academy" movie who could imitate the sounds of a pinball machine and most anything else. It is rather amazing that a bird can do all that, and so convincingly.