The armature for the crab is covered with the shell of a real crab instead of the usual latex.
Ray Harryhausen bought three crabs for the production, having one humanely killed by a museum employee as boiling it would have changed the color of the shell. The other two were used for close-ups of the crabs' mandibles, which would otherwise have required a huge amount of time to properly animate. These crabs subsequently served as a dinner entrée for Harryhausen and producer
Charles H. Schneer.
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