Some of the dinosaur sounds in Jurassic Park were created from samples of tortoises mating.

The Spielberg classic is often praised for its use of groundbreaking visual effects and audio, but Gary Rydstrom - the film's sound designer - revealed the origins of the velociraptor's cries.

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He told Vulture: "It's somewhat embarrassing, but when the raptors bark at each other to communicate, it's a tortoise having sex.

"I recorded that at Marine World... The people there said, 'Would you like to record these two tortoises that are mating?'

"It sounded like a joke, because tortoises mating can take a long time. You've got to have plenty of time to sit around and watch and record them."

Rydstrom continued: "When the raptor shows up in the door window in the kitchen, the breathing noise is a horse. We used the horse in about three to four different dinosaurs."

Jurassic Park was recently re-released for its 20th Anniversary in 3D and IMAX 3D, with a fourth instalment coming in 2014.

Watch the 3D IMAX trailer for Jurassic Park below:

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