 The stop-motion animation scenes were painstaking and difficult to achieve and complete after the special effects crew realized that they could not stop, because it would make the movements of the creatures seem inconsistent and the lighting would not have the same intensity over the many days it took to fully animate a finished sequence.A device called the surface gauge was used in order to keep track of the stop-motion animation performance.The iconic fight between Kong and the "Tyrannosaurus" took seven weeks to be completed.