It is very unique because it was designed like a stop-motion model, but was modified into a live-action mechanical model.
The live-action capability was necessary when the beast was photographed in the water and splashed about. The brontosaur grabbed miniature models of people from the water and tossed the loosely jointed puppets from its jaws.
King Kong is a American pre-Code monster adventure film directed and produced by Merian C. Cooper and Ernest B. Schoedsack. It stars Fay Wray, Bruce Cabot and Robert Armstrong, and opened in New York City on March 2, 1933.
The film portrays the story of a huge, gorilla-like creature dubbed Kong who perishes in an attempt to possess a beautiful young woman.
The actual animation model of the dinosaur which was used in both the original 1933 King Kong and Son of Kong is presented in the Dinosaur Museum in Blanding, Utah.