GalleyCat reports that this is an homemade video about a nonfiction book called "A Lion Called Christian" by Anthony Bourke and John Rendall. What's even more interesting about this story is that this is an out-of print book and was according to the report the sixth most wanted out-of-print book of 2008.

The true story of a lion cub taken from his zoo-caged parents and sold in a London department store, and bought by two of the most understanding men a lion could hope to meet. Named "Christian", this remarkably gentle and intelligent lion became a British celebrity and professional model. As he reached maturity, his owners decided to give him something he was never destined for: freedom to live as a wild lion in Africa. A chance meeting with "Born Free" stars Bill Travers and Virginia McKenna led to an appeal to George Adamson to take Christian and teach him how to be a wild lion.
And it looks like the interest generated by this book trailer actually helped to get this book back to the print! I read on the book's website that the book will be reprinted in an expanded (224 pages) version in March, 2009! You can already pre-order it on Amazon.com.
Yours,
Raz @ Eco-Libris
www.ecolibris.net