There are many excellent nature documentary films but not many showing the the making of them.
I had the chance today to view John Young's film "Ghosts of the Forest" and it is a must on the library of any photographer or film making person interested in filming birds.
John is an Australian photographer and naturalist living north of Queensland.
He has a very informative page HERE where you can read about him, many articles, and also buy some of his films.
He does tour guides to many places including Cape York. I guess that going to the Cape for a photography expedition with him will be an experience of a life time. When you see the video you will know what I mean.

Cheers