Secret of 'Jurassic Park' raptor sounds? Tortoise sex - CNET

Dinosaurs may be visually terrifying but Lucasfilm sound designer Gary Rydstrom confirms that tortoises mating make for great velociraptor vocals.

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The terrifying noises made by the raptors in Jurassic Park (1993) were sourced from recordings of tortoises mating. The sound designer also experimented with horses breathing and geese hissing, but the tortoises proved the most evocative. : r/MovieDetails

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