The T. rex animatronic was designed by a team of approximately eighteen people, led by creature effects supervisor Neal Scanlan, who also did effects work on the Star Wars sequel trilogy and spin-offs. A small scale maquette was designed, and shown off, and the full scale model was designed to move its head, neck and part of its torso, with the legs and rear being essentially designed as a stand in for CGI effects added later on in the development process. Also having articulated eyes, and able to roar, and the effects team would use an unknown cocktail of slimy liquids to imitate saliva, which was done by manually spreading it onto the creation's teeth and mouth.

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