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Jurassic Park brought its dinosaurs to life with a blend of full-scale animatronics, puppets, performers in creature suits and computer-generated imagery (CGI). The filmmakers chose techniques for individual shots: physical creatures could occupy the set with actors, while ILM’s digital dinosaurs enabled movement and camera views that practical builds could not provide as easily.
How the film combined practical creatures and CGI
The production initially considered go-motion, a technique that animates models frame by frame while capturing motion blur. A successful digital dinosaur test changed the plan: the film would combine CGI from Industrial Light & Magic (ILM) with full-scale animatronic creations by Stan Winston and his studio. Amblin’s production summary describes that decision, and ILM’s effects history recounts how the digital test became a turning point.
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This was not a choice between using practical effects or CGI for the whole movie. Physical builds gave actors and cinematographers real creatures to work with on set; digital dinosaurs offered flexibility for shots requiring movement or views difficult to achieve with a large mechanical model. The film’s effects were selected shot by shot rather than assigned to competing camps.
Stan Winston Studio built and performed the physical dinosaurs
Stan Winston Studio created the full-scale animatronics and creature puppets. The American Society of Cinematographers’ retrospective says Winston oversaw the animatronic dinosaurs, which made up the vast majority of the animals’ screen time. The ASC’s production account places those practical creatures at the center of the film’s on-screen dinosaur work.
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ILM developed the digital dinosaurs
ILM created the computer-generated dinosaurs and the tools and compositing workflow to integrate them with live-action footage. Its effects-history page identifies Dennis Muren as visual effects supervisor, Janet Healy as visual effects producer, TyRuben Ellingson as visual effects art director and Mark A.Z. Dippe as co-visual effects supervisor. ILM’s credits and production history document the team’s roles.
Phil Tippett’s motion expertise still mattered
Phil Tippett’s team had been expected to use go-motion, but that did not remain the final-effects method. Tippett’s animation expertise continued to inform the work: an armature with encoders and ILM’s Tondreau Go-Motion system translated stop-motion-style movements into digital data for CG models in Softimage. In other words, the move to digital dinosaurs did not make the earlier motion work irrelevant. ILM’s 2015 production retrospective describes this link between the planned technique and the digital workflow.
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What the effects figures say—and what they do not
ILM’s production history reports fewer than 60 fully CG-dinosaur shots. Its 2015 retrospective separately reports six minutes of CG dinosaurs and nine minutes of practical puppets in the final cut. Those are duration figures, not counts of all effects shots or a complete tally of every physical creature; they show that the practical dinosaurs occupied more reported screen time than the CG dinosaurs. ILM’s effects history gives the shot count, while its retrospective gives the screen-time figures.
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Why the raptors changed form from shot to shot
The kitchen sequence makes the production’s shot-by-shot approach especially clear. The raptors were portrayed using full-size cable-controlled puppets, half-puppets, insert legs and suit performers. Which form appeared depended on the framing, the movement required and what the camera could see. A full-body creature, a close-up head and a pair of legs moving through frame did not need the same rig.
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Full-size puppets and partial builds
For shots that called for a controlled physical dinosaur, the team used cable-controlled puppets. Half-puppets and insert heads could fill the frame when counters or other set pieces hid the rest of the creature. Insert legs handled shots that needed only that part of the animal. These purpose-built versions let the filmmakers show convincing physical detail without forcing one unwieldy mechanism to serve every camera angle. Stan Winston School’s account of the kitchen sequence describes the different puppet forms.
A rod-and-dolly rig beneath the kitchen set
One kitchen raptor puppet was attached to a rod that passed through a slot in the floor, then moved on a dolly beneath the set. The concealed rig let the puppet travel through the scene while keeping the mechanism out of view. Where counters obscured the creature, the filmmakers could use a half-puppet or insert head rather than showing a complete raptor and its rig. Stan Winston School details the setup.
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Suit performers supplied the creature’s acting
John Rosengrant and Mark “Crash” McCreery performed in raptor suits. Rosengrant rehearsed for weeks, drawing on raptor behavior illustrated in Tippett’s animatics. He described the performer’s role this way: “All of their work can be for nothing if you can’t bring that character to life inside the suit.” The kitchen sequence took about two weeks to shoot, according to Stan Winston School’s 2023 account. The suit’s construction provided the creature’s shape, but posture and movement depended on the person inside it.
Why the blend worked
Practical effects gave the crew tangible creatures to light, frame and place beside the actors. Puppets, partial builds and suits each solved different physical staging problems. CGI let ILM create dinosaurs in motion and integrate them into live-action shots with greater freedom than a large mechanical build allowed. Together, the approaches made it possible to give the dinosaurs both physical presence and movement that would have been difficult to achieve with a single technique.
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ILM’s history captures the significance of the digital work in its own retrospective language: “No one had put living, breathing synthetic animals in a live-action movie before; creature animation had always been mechanical and animatronic.” The achievement was not that CGI replaced the practical creatures. It was that digital animation joined an established practical-effects craft to extend what the film could put on screen. ILM’s effects history recounts the production’s approach.
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