In most wildlife films, the sounds you hear were not recorded while the cameras were rolling. Most filmmakers use long telephoto lenses to film animals, but there’s no sonic equivalent of a zoom lens. Good audio requires a microphone close to the source of the sound, which can be difficult and dangerous. And so many of the subtle movement sounds -- a chimpanzee rustling through leaves, or a hippo squelching in the muck, or a lizard fleeing snakes -- don’t come from animals at all. They’re made by Foley artists.
