Also known as Sapium silkworm moth, is a huge moth, is one of the largest moths in the world. It is mainly found in the tropical and subtropical rainforests of Southeast Asia. The color of the wings is auburn, with a unique snake-head pattern, and the two black round spots at the tip of the wings are like snake eyes. This mimicry may be used to defend against natural enemies. It is nocturnal and feeds on the leaves of trees, especially the tallow tree, hence its name. The larval period will be spent in a cocoon with an extremely narrow opening, and the wings must be spread through the narrow cocoon hole, which helps their wings become bloodshot and ready for flight. Adulthood has a short lifespan, does not feed, and mainly mates and lays eggs.

The emperor moth is a large moth species known for its spectacular wings and unique life cycle. The wings can extend up to 20 to 30 centimeters, making it one of the largest species of moths with wings. The larval stage is spent in a very narrow cocoon, and when they are ready to transform into adults, they must pass through a cocoon opening that is relatively small to their own body. For them, it is a huge challenge because only through this difficult process can the wings obtain sufficient blood supply and thus acquire the ability to fly. The mouthparts of adult insects will degrade after metamorphosis, so they cannot eat and can only rely on the energy stored during the larval stage for survival.