With the recent re-release of Jurassic Park in 3D (read our review) plenty of fans are waxing nostalgic about the beloved dinosaur franchise. IGN's own Lucy O'Brien recently wrote an editorial on why it's her favorite film. There have been a wealth of behind-the-scenes featuretts detailing how the effects team created the revolutionary look of the dinosaurs using a combination of CGI and practical effects.

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Here's one we didn't know, though: The dinosaur sound effects were created with animal sex sounds. Yep, Vulture reports that recordings of animals either in the midst of, or gearing up for, a "romantic moment" were used. Velociraptor = turtle love."It's somewhat embarrassing, but when the raptors bark at each other to communicate, it's a tortoise having sex," Jurassic Park sound designer Gary Rydstrom told the outlet.But wait, there's more. The sound of the flock of Gallimimus that nearly stampedes Dr. Grant, Tim, and Lex were made using a recording of a horse in heat trying to get the attention of a stud.T-Rex eating a human? Dolphin in heat.There were some G-rated sounds as well. A baby elephant was used for the T-Rex's roar, for example. Pretty fascinating stuff, technically speaking. As to how this effects your image of a beloved childhood favorite? We leave that to each individual to decide for themselves...Thanks to Gizmodo for bringing this to our attention.

Roth Cornet is an Entertainment Editor for IGN. You can follow her on Twitter at @RothCornet and IGN at Roth-IGN