The large and small squids are made of a special thermochrome plastic. When the water temperature changes, the color of the plastic changes. This change of color sensitive to heat takes place at a temperature of 33 ° C. After cooling, the color of the plastic returns to its original color. Color change of the big squid: Caribbean blue to white. Color change of the small squid: red to pale yellow. A pair of tentacles provided with a grip so that they can grab objects or cling to them.