If anyone knows how the iconic Predator "click" vocalizations were created (for the original film, that is), then please, do share! (This means you David Stone, Richard Anderson and John Pospisil!) If you don't, then I'm open to your theories!
PS> Let's keep this thread dedicated to this question; if you want to discuss a different iconic sound and how it was created, please start a new thread following the convention of Vol. 1, Vol. 2, etc. etc.