Because the dinosaurs couldn’t be life-size animatronic recreations, Spielberg had to think a little differently—so he assembled a group of special effects legends to create his vision forJurassic Park:
Stan Winston and his team, which created the exoskeleton from The Terminator, would build and operate the live-action dinosaur robots. Some creations, including the T. Rex, were full dinosaurs, but most were just the upper half—including the head and torso of certain dinosaurs—while others were the just bottom half, including the legs and claws. Here's footage of the 7.5-foot-tall Brachiosaurus puppet, which included just the head and neck: