What makes the madagascan sunset moth a and not butterfly?

The madagascan sunset moth is a moth, not a butterfly. Butterflies belong to the order Lepidoptera and moths belong to the order Mecoptera. One of the key differences between moths and butterflies is the shape of their antennae. Moths have feathery antennae while butterflies have club-shaped antennae. Moths also tend to be more active at night while butterflies are active during the day. Additionally, moths have a larger wingspan than butterflies.