Documentation
A work, such as a film or television program, presenting political, social, or historical subject matter in a factual, objective and informative manner and often consisting of actual news films or interviews accompanied by narration.
“Walking with Dinosaurs” is a remarkable achievement that has a number of surprises. Not only is it the best and most vivid documentation you will find anywhere about the time when dinosaurs ruled the Earth, its presentation is also spectacular to make the best of the material.
SOURCES:
http://dictionary.reference.com/search?q=documentary
http://www.dvdreview.com/fullreviews/walking_with_dinosaurs.shtml