Which cult classic did they pull sounds from for Predator 2?

I think we can all agree: Predators make cool sounds. Not that I would ever want to hear that sound in real life, but still.

The sound artists for Predator 2 came up with a clever way to both creep us out AND honor one of my favorite early '90s sci-fi/action movies. Maybe you read about this somewhere...

Which movie did they recycle sounds from for Predator 2?

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