“If people knew where the sounds in Jurassic Park came from, it’d be rated R!” laughed Gary Rydstrom. Rydstrom received two Academy Awards for the sound effects during the release of the Jurassic Park in 1993. He was commissioned to produce dozens of dinosaur sounds and on his quest for the perfect combination of sounds he recorded some unusual sounds.

“It’s somewhat embarrassing, but when the raptors bark at each other to communicate, it’s a tortoise having sex,” said Rydstrom. “It’s a mating tortoise! 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.”

Gary Rydstrom interviewed and commented on almost all the sounds in Jurassic Park at vulture.com.