Three different models were built for the adult Mothra, each with different functions. A mid-sized model with more flexible wings was used for the hatching scene. The mid-size model has a smaller thorax and the wingspan is shorter, compared to the other models. The large model was built in 1/100th scale with a wingspan of 2.5 meters. Due to this, the wing movement was less flexible. The eyes were lit by lightbulbs from inside the head and the eyes were constructed from clear latex. The smaller model was only used for extreme long shots of Mothra advancing on New Kirk City. To make the wings flap, the models were suspended on wires from an overhead motorized brace that would open and close. The wires were attached at the center of the wings rather than the tips, which allowed the wings to feely flap at the edges.