You're listening to 20,000 Hertz.

When Jurassic Park first came out, it brought dinosaurs to life in a way that people had never experienced before.

Not only did the dinosaurs look incredible, but they also sounded amazing.

Up until that point, there hadn't been a clear idea in the public consciousness about what dinosaurs sounded like,

so the filmmakers essentially had to make it up as they went along.

To make these creatures sound believable and alive, they used all kinds of creative sound design techniques. The results are the

stuff of sound design legend. Over the nearly 30-year history of the Jurassic Park franchise,

the sound designers have faced one persistent challenge. How do you define the sound of an extinct

animal that no one has actually ever heard for real?

And how do you make it convincing?

That's Al Nelson, the lead sound designer on the new Jurassic World Films.

Al works at Skywalker Sound, which is the sound division of Lucasfilm.

Where we're coming from from the film sound standpoint is, is it believable, but is it also creating emotional context and is it helping the story?

Early in his career, Al worked with sound design superstars like Ben Burt, the sound designer

of Star Wars, as well as Gary Rydstrom and Chris Boyes, who made the sounds for the original

Jurassic Park movies.

That's where I got my real education and experience.

There's this wonderful legacy at Skywalker of these brilliant icons with Ben and Gary.

Then there's this second generation, people like Chris Boyes and a handful of others.

And then I was part of the third generation.

Working at Skywalker Sound, Al got to see firsthand how some of the classic Jurassic Park sounds were made.

To Al, there's one sound that stands above all the rest.

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