Actias luna

(Linnaeus, 1758)

Luna Moth, North American Luna Moon Moth

Actias luna, the Luna , is a large, lime-green moth to North America, recognized as one of the continent's most visually striking . possess a wingspan reaching up to 114 mm (4.5 inches), with distinctive elongated tails and prominent that may confuse . The exhibits strong : males have highly feathery for detecting female , while females have slender antennae and larger . feed on a variety of trees including sweetgum, hickory, walnut, birch, and sumac. The moth is in northern portions of its range, with larvae in leaf-litter-camouflaged before emerging as adults in spring; southern may produce two or three annually.

Actias luna by (c) Michael J. Papay, some rights reserved (CC BY), uploaded by Michael J. Papay. Used under a CC-BY license.

Actias luna by (c) Michelle W. （鍾偉瑋）, some rights reserved (CC BY), uploaded by Michelle W. （鍾偉瑋）. Used under a CC-BY license.

Actias luna by no rights reserved, uploaded by Bruce Cook. Used under a CC0 license.

Pronunciation

How to pronounce Actias luna: //ˈæktiəs ˈluːnə//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

The Luna is immediately recognizable by its pale lime-green , long, tapering tails (up to 8 cm), and large, circular on each wing—transparent with dark borders on the and dark-centered with rings on the hindwings. lack functional mouthparts and do not feed. Males are distinguished by their broadly (feathery) , while females possess simple, antennae. The body is and densely hairy. are bright green with pale stripes, raised yellow , and a pale green ; mature reach approximately 8 cm in length. Similar large green saturniids include the Imperial moth (Eacles imperialis), which lacks tails and has more variable coloration, and the Cynthia moth (Samia cynthia), an with more rounded wings and shorter tails.

Images

Habitat

Deciduous and mixed hardwood forests, suburban woodlots, and riparian corridors where trees occur. Found from southern Canada through the eastern United States to eastern Texas and Florida. are frequently attracted to artificial lighting at night, often resulting in mortality or displacement from natural .

Distribution

Nearctic region: eastern North America from Saskatchewan, Manitoba, and Alberta in Canada south through the eastern United States to Florida and eastern Texas. Absent from the western Great Plains and most of the western United States.

Seasonality

emerge in spring (April–June in northern range), with peak activity varying by latitude. Southern may have multiple with adults present from March through September. Northern populations are , with a single emerging after winter pupal .

Diet

: non-feeding; lack functional mouthparts and survive on stored larval fat reserves. : folivorous, feeding on leaves of sweetgum (Liquidambar styraciflua), hickory (Carya spp.), walnut (Juglans spp.), birch (Betula spp.), sumac (Rhus spp.), persimmon (Diospyros virginiana), and occasionally other hardwoods.

Life Cycle

with four stages. laid on leaves; progress through five over 3–4 weeks. Mature larvae descend to ground and spin dense, oval incorporating leaves for , entering for winter. Pupal stage lasts 2–3 weeks in spring, triggered by warming temperatures and cues. lifespan is approximately one week; sole purpose is .

Behavior

are strictly , with males actively flying to locate females using via their . Both sexes are strongly attracted to artificial light sources, a that frequently results in disorientation, exhaustion, and . When disturbed, adults may rotate rapidly to confuse ; the may direct attacks toward the tails, which can be autotomized without fatal injury. are solitary feeders.

Ecological Role

Larval on hardwood trees; source for insectivorous birds, small mammals, and . serve as for bats and birds. Documented for the parasitoid wasp Cotesia nuellorum in Texas. The ' dense, contribute to leaf litter decomposition dynamics.

Human Relevance

Highly valued in entomological education and outreach due to its striking appearance and non-threatening nature; frequently featured in museum exhibits and school programs. Subject of extensive folklore, including positive symbolic associations with and rebirth, countering typical negative stereotypes. Occasionally reared by hobbyists. Light pollution poses significant concern, as artificial lighting disrupts natural and causes substantial mortality.

Similar Taxa

Eacles imperialis (Imperial Moth)Large size and green coloration overlap, but lacks tails, has more variable color patterns (, orange, or variants), and possesses functional mouthparts as .
Antheraea polyphemus (Polyphemus Moth)Similar large size and , but tan to coloration, more rounded , and shorter, less tapered tails.
Actias dubernardi (Chinese Moon Moth)Convergent appearance with long tails and green coloration, but Asian distribution, more pinkish bases, and different associations.
Samia cynthia (Cynthia Moth) to North America; green with tails but more rounded shape, shorter tails, and distinct dark postmedian on wings.