Doing live voice over narration for nature films

would be fun.
Just imagine, the camera crew and scientists (maybe one and the same) spend days tracking the elusive Rarebeast™ and finally get a shot of some previously unkown behavior when…

You loudly and clearly (for better audio reproduction, you see) say, “Here at last we have this rare and elusive creature in our camera’s sights as it exhibits this fascinating and never before seen behavior!

I imagine the fim crew/scientists would welcome the time and cost savings.

Tough crowd.