Luna Silkmoth

The luna silkmoth is a large member of the family Saturniidae, the giant silkmoths, and one of the most instantly recognizable moths found in North America thanks to its soft green coloring and elegant, elongated hindwing tails. It is found throughout much of the eastern half of the continent, from the boreal forests of Canada down through the eastern and southeastern United States.

As with most Saturniidae, the adult luna moth does not feed and survives only on energy reserves accumulated during its caterpillar stage, giving it a very short adult lifespan devoted entirely to mating and reproduction.

Its combination of pale green coloring, translucent eyespots, and long, twisting tails has made it a favorite subject for nature photography and a commonly cited example of large native silkmoths in North America.

• Very large, pale lime-green wings with a slightly translucent, almost pastel quality; forewings often edged in a thin purple-brown line.
• Hindwings taper into long, twisted tails that can trail well beyond the rest of the wing, a hallmark feature of the species.
• Each wing bears a small, eye-like spot near the center, more subtle than the bold eyespots of some related silkmoths.
• Antennae are broad and feathery, especially in males, adapted for detecting female pheromones over distance; the body is stout and densely furred white.

Found from southern Canada through the eastern and southeastern United States, the luna silkmoth inhabits deciduous forests where its larval host trees, including birch, hickory, walnut, and sweetgum, are common. Adults fly primarily at night from spring through summer, with the timing and number of generations varying by latitude, and are most often seen resting on vegetation near woodland edges or drawn to lights after dark.

Adults are strictly nocturnal and do not feed, living only about a week as adults, during which their sole purpose is to locate a mate and reproduce using pheromone signals detected by their large, feathery antennae. Larvae are large, plump, bright green caterpillars that feed heavily on the foliage of deciduous host trees, playing a role as a food source for birds and other predators within forest food webs. The species has no defensive display beyond camouflage and its overall size, relying on its short adult lifespan and nocturnal habits to reduce predation risk.

Eggs are laid on the leaves of suitable host trees and hatch into green, spined caterpillars that grow through five instars over several weeks, consuming large quantities of foliage. Mature larvae spin a papery cocoon, often wrapped in a leaf, in which they pupate, and in northern parts of the range the pupa overwinters through the cold months. Depending on latitude, the species produces one generation per year in the north and two or more generations in warmer southern regions, with adults emerging over spring and summer to complete the cycle.