What is the largest animatronic dinosaur?

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2023 marks the 30th anniversary of Steven Spielberg’s colossal Jurassic Park – and what better way to celebrate it than with a colossal record?

With a length of nearly 13.7m (45 ft), this majestic animal was the largest carnivorous dinosaur that ever existed. It could weigh up to 6 tonnes and is widely known to be a contender for the title of longest and largest theropod dinosaur ever.

It is no surprise, then, that this incredible dino would become the largest movie animatronic ever once recreated for Stan Winston Studios.

The first step was to create a scaled-down, highly detailed model of the Spinosaurus. That would serve as a base for the much larger, much more complicated mechanical model.

From there, the special effects team created a massive replica of a true Spinosaurus – a roaring mechanical animal with crocodile-like eyes, ready to cause havoc on set.

In 1993, for the first movie, not all the animals were mechanized. Some of them had real actors inside, wearing a dino suit and allowing the animals to move: that was the case for the raptors.

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But who was the real Spinosaurus, the majestic ruler of the rivers?

Originally from an area we now identify as Africa, the first traces of the Spinosaurus were discovered in Egypt in 1912 and later described by German paleontologist Ernst Stromer in 1915.

However, it was not until the 21st century that we learned more about these giants of the past.

As new fossils were discovered, paleontologists all over the world gained a better understanding of this majestic beast – to the point that, today, we can recreate a mechanical replica that looks terrifyingly similar to the real deal.

The lizard-like dinosaur was part of the theropod family like the equally terrifying T-rex (perhaps the most famous of Jurassic Park’s stars): their family is characterized by their bipedal stance, sharp teeth, and an elongated skull similar to a crocodile.

The Jurassic Park team based their very own Spinosaurus’s eyes on the ones of a real-life crocodile.

Speaking of crocs, have you met Cassius yet? He's the largest crocodile ever!

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The Spinosaurus is set apart from their big carnivorous relatives thanks to their extraordinary adaptations for a semi-aquatic lifestyle. It led modern experts to believe that this creature lived along rivers and lakes.

With elongated jaws filled with conical teeth, these dinosaurs were perfectly suited to catch fish and other aquatic prey. Their long snouts and narrow jaws are reminiscent of modern-day reptiles.

The most recognizable feature remains the structure (also called a hump) on its back.

Modern studies have suggested a variety of purposes for the impressive tail fin that bloomed on the back of the Spinosaurus.

Although some suggest that it could have served a purpose similar to the dorsal fins of sailfish, with a hydrodynamic purpose and aiding with hunting in the water, other experts tend to believe that it was probably utilized more for display and species recognition rather than swimming.

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For Jurassic Park’s Spinosaurus, the majestic sail-like structure was made of rubber and foam.

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This water-dwelling predator has sparked, and continues to ignite, numerous debates among scientists.

In the meantime, 99 million years after the time when this majestic beast roamed the earth, the cinematic sensation Jurassic Park continues to break records.

To this day, Steven Spielberg’s game-changing blockbuster remains the highest-grossing dinosaur franchise ever.

The 2015 sequel Jurassic World, set in the same universe of Jurassic Park, became the highest-grossing dinosaur movie ever.

And did you know that, despite being the stars of the franchise, in the first 1993 movie the dinosaurs only appear for 15 minutes, while the film clocks at 127 minutes runtime?

They're barely present, yet they are unforgettable!

An animatronic Spinosaurus was built for the third installment of the Jurassic Park franchise. The animatronic was the largest built by Stan Winston Studios and also the most dynamic. The Spinosaurus animatronic first appeared in a scene in which the Spinosaurus attacks the main protagonist in a downed airplane. It was used again for a battle scene in which it faced down against a Tyrannosaurus. However, most of the scenes involving the animatronics never made it into the actual film. Lastly, the animatronic was used in a scene in which it attacks the protagonists on a barge in the middle of a river.

Design

The Spinosaurus was originally designed by Stan Winston Studio artist, Mark “Crash” McCreery, while concept colorations were drawn up by Jurassic Park 3 storyboard artist Ricardo Delgado. Key artist Joey Orosco, along with John Rosengrant, Rob Ramsdell, Paul Mejias, and Trevor Hensley, sculpted a one-fifth-scale maquette based on McCreery’s original design. According to Orosco, since a partial Spinosaurus skull was discovered around the time of preproduction for the third film, the filmmakers decided to add it into the franchise. Paleontologist consultant Jack Horner also suggested Spinosaurus as the new dinosaur to introduce it to the public as an alternative to the franchise’s previous Tyrannosaurs. Horner also helped the design team in the coloration choices.

Full-Sized Animatronic Spinosaurus

Unlike the Tyrannosaurus, in which warm clay was sculpted into a full-scale model, the one-fifth-scale Spinosaurus maquette was digitally scanned and computer-milled into foam pieces. The foam was then assembled into the full-scale Spinosaurus. To get the Spinosaurus prepared for molding, the foam was coated with a type of paint to help seal the foam from the high-temperature epoxy. All joints were filled in with clay. After the epoxy was applied, it was followed up by a fiberglass-type cloth. A structure in the sail allowed the sail to flex with the animatronic’s spine. The animatronic was then broken down to fit in the ovens and a special-made spandex was applied and would be the under-surface for the one to three-inch skin.

When completed, the Spinosaurus measured around 13.7 meters (45ft) in length and weighed around 12.5 tons. The “skull” was built out of graphite which made it both light and strong. It held approximately seventy-six teeth within the jawline, although several more sets were molded in the unavoidable event that teeth would be lost or damaged during film shoots. Based on the design of the Tyrannosaurus animatronics used in The Lost World: Jurassic Park, the Spinosaurus was built from the “knees up” and mounted to a motorized trackway. The Spinosaurus was the fastest animatronic built by the studio and used ‘hot-rod’ hydraulics that were controlled using an eighteen-inch telemetry device. The Spinosaurus ran on nearly 1,000 horsepower compared to the previous Tyrannosaurus, which only ran on 200 horsepower.

The Spinosaurus then had to be loaded onto a tractor trailer, using cranes, and moved to the set. The animatronic was so big that the studio had to remove the doors to get it outside. The city of Los Angeles wanted the animatronic to be moved at night on a specific route, as it couldn’t go under bridges, so traffic in the city wouldn’t be stalled. Final paint details were added on the set. On set usage was very intense. Due to the power of the hydraulically run animatronic, a powerful hit from the snout could send a man twenty feet in the air, or even kill them. As such, extra precautions were taken when using the animatronic, and, like with the Tyrannosaurus animatronics used in the previous films, only those who were absolutely necessary for the filming of a scene were allowed on the set.

Because the Spinosaurus versus T. rex fight was the final scene filmed with the Spinosaurus animatronic, the Stan Winston Studios crew decided to go all out in the battle. The crew had the puppets act out as if they were fighting a real battle. However, during the fight, the Spinosaurus‘ superior powerful hydraulics literally allowed the Spinosaurus to behead the Tyrannosaurus animatronic with a single swipe from the Spinosaurus‘ clawed arm. During the filming of the final climactic river fight where the Spinosaurus ambushes the protagonists, Stan Winston Studios deliberately left loose calibrations on the Spinosaurus animatronic in the event that water seepage would affect the weight-based hydraulics. The foam latex skin was also coated in several water-tight sealants, and the head of the animatronic was made out of hard urethane rubber. The interior robotics of the animatronic were all sealed against water.

Works Cited:

What are Spinosaurus Made of? An awesome look at the making of the 12-ton, thousand-horsepower dinosaur. Stan Winston School of Character Arts (2013)

The Winston Effect: The Art and History of Stan Winston Studios (Duncan 2006)

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