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Sounds in almost all nature documentary videos are added later from separate sources.

• odyssey7 3y ago
  That makes sense. I'd never thought about it. You've saved me the disappointment of visiting Antarctica to realize that David Attenborough's voice doesn't just chime in whenever you look at something.
  • stavros 3y ago
    Surprisingly, the voice is the only part of the audio that's real.
  • cozzyd 3y ago
    Been to Antarctica twice. Attenborough's voice definitely chimes in.