For the buffalo scenes, producer Laurentiis hired on Carlo Rambaldi to design an animatronic full-size bison which would slide around on tracks.
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De Rossi was next called by Dino De Laurentiis to work with Carlo Rambaldi to create the on-set practical effects for two films in Mexico including the sci fi blockbuster Dune, for which he worked wonders, creating the fetus-shaped Spice Guild Navigator seen floating in a tank.