The adult Luna Moth has no mouth and dies of starvation.

The Luna Moth wings are very small when they first emerge and they must enlarge them by pumping bodily fluids through them. During this time, their wings will be soft and they must climb somewhere safe to wait for their wings to harden before they can fly away. This process takes about 2 hours to complete. The Luna Moth typically has a wingspan of 8–11.5 cm (3.1–4.5 in), rarely exceeding 17.78 cm (7.00 in) with long, tapering hindwings, which have eyespots on them in order to confuse potential predators. Although rarely seen due to their very brief (1 week) adult lives, Luna Moths are considered common. As with allSaturniidae, the adults do not eat or have mouths. They emerge as adults solely to mate, and as such, only live approximately one week. They are more commonly seen at night.