The Luna Moth, scientifically known as Actias luna, is a fascinating creature with a unique life cycle. This remarkable insect boasts an impressive wingspan that ranges between 3 to 4.5 inches and displays a beautiful sea-foam green to yellow color. Among its striking features are long, elegant tails, making it a favorite among moth enthusiasts.
Native to the eastern portion of the United States, the Luna Moth’s life span varies depending on its geographic location. In warmer southern states like Florida, these moths can be found year-round, with up to three generations born annually. On the other hand, in colder northern regions, Luna Moths typically produce only one generation per year.
The life cycle of the Luna Moth consists of four stages: egg, caterpillar (larva), pupa (inside a cocoon), and adult moth. The eggs are laid on host plants, and upon hatching, the caterpillars feed and grow. They eventually transform into a pupa within a cocoon, spun among leaf litter on the ground. Adult Luna Moths emerge to continue the cycle, gracing the night with their captivating presence.
Luna Moth Life Cycle Overview
Luna moth eggs are laid on host plants where they incubate for 8-13 days before hatching.
- Host plants examples: Hickory, walnut, and sweet gum trees.
After hatching, the bright green caterpillars feed and grow larger. These herbivore larvae graze on host plant leaves. Here are some distinct larval features:
- Bright green body
- Convex segments with yellow bands
- 5 instar stages
Once they reach the final instar stage, caterpillars spin a thin, silken cocoon among leaf litter on the ground. They then pupate inside the cocoon.
The winged adult moths emerge from the cocoon. The number of generations varies based on geography, with one generation (univoltine) in the north, two generations (bivoltine) in the Ohio Valley, and three generations (trivoltine) in the southern region. Adult Luna moths are characterized by:
- Pale or lime green color
- Long tail on each hind wing
- Discal eyespots on all wings
- Feathery antennae
Comparison Table: Luna Moth Characteristics at Different Life Stages
|Egg||8-13 days||Laid on host plants, small and round|
|Larva (Caterpillar)||Varies||Bright green, convex segments, yellow bands, feeds on host plants|
|Pupa (Cocoon)||Varies||Thin silken cocoon, camouflaged among leaf litter|
|Adult||Varies||Pale or lime green, eyespots on wings, long tail on hind wings, feathery antennae|
Morphology and Appearance
Color and Pattern
The luna moth is known for its stunning color, with an overall shade that varies from pale to lime green. A dark leading edge is seen on its forewings. Its breathtaking pattern includes its four eyespots.
Wings and Antennae
With an impressive wingspan of 3-4.5 inches, the luna moth’s wings boast long, tapering tails. Its antennae are attention-getting too:
- Males have feathery antennae
- Females have less-fringed antennae
Male vs Female
Here’s a comparison of male and female luna moths:
|Body Color||Bright green||Bright green|
|Wingspan||3-4.5 inches||3-4.5 inches|
The luna moth’s bright green color and mesmerizing details make it one of the most visually striking moths found in North America.
Luna Moth Reproduction
The mating process of Luna Moths relies on the female releasing a sex pheromone to attract male moths. Males have larger antennae to better detect these pheromones. Once a male detects a female’s scent, he follows the pheromone trail to find and mate with her.
After a successful mating, female Luna Moths lay their eggs on suitable host plants. They lay oval-shaped eggs that incubate for 8-13 days before hatching into caterpillars (larvae).
Luna Moths have different numbers of generations depending on their geographic location:
- Univoltine (one generation per year): Michigan and northward
- Bivoltine (two generations per year): Throughout the Ohio Valley
- Trivoltine (three generations per year): Southward locations like Missouri
|Geographic location||Generations per year|
|Michigan and northward||1 (univoltine)|
|Ohio Valley||2 (bivoltine)|
|Southward locations||3 (trivoltine)|
Key features of Luna Moth reproduction:
- Female releases sex pheromone to attract male
- Male has larger antennae to detect female pheromone
- Oval-shaped eggs laid on host plants
- Egg incubation period of 8-13 days
- Different number of generations depending on location
Habitat and Host Plants
The luna moth (Actias luna) is native to North America, and it can be found from Canada down to the southern United States. In the north, the luna moth is univoltine, meaning it has one generation per year, while in the south, it can have up to three generations per year1.
Preferred Plant Species
Luna moth caterpillars feed on a variety of plant species, predominantly deciduous trees. Some common host plants include:
- White birch
- Sweet gum
These caterpillars will munch on the foliage of their chosen host plant, eventually growing and preparing to pupate2.
Role of Leaves in Life Cycle
The leaves of host plants play a crucial role in the luna moth’s life cycle. Adult female luna moths lay eggs on the leaves, either singly or in clusters3. Eggs will hatch into caterpillars, which will then feed on the leaves to grow and develop. The foliage provides the necessary nutrients for caterpillars to metamorphose successfully.
Predators and Defensive Mechanisms
Luna moth caterpillars and adult moths serve as a source of food for various predators. Examples of these predators include:
- Small mammals
Eyespots and Tails
Luna moths have unique features that help them deter their predators:
- Eyespots: Visible on their wings, these circular markings resemble eyes and can startle or confuse predators.
- Tails: The long tails on the hindwings of luna moths disrupt the echolocation abilities of bats, helping them evade capture.
Luna moths employ several additional strategies to avoid becoming prey for bats:
- Clicking noises: Luna moth caterpillars can make clicking noises with their mandibles as a warning signal to deter predators.
- Vomiting: In a last-ditch effort, caterpillars may vomit to further discourage an attacking predator.
|Luna Moth Features||Purpose|
|Eyespots||Confuse or startle predators|
|Tails||Disrupt bat echolocation|
|Clicking noises||Deter predators|
|Vomiting||Last resort to deter an attacker|
These defense mechanisms, along with their striking appearance, enable luna moths to survive predation attempts and successfully complete their life cycle.
Additional Luna Moth Facts
Lack of Mouthparts
The adult Luna Moth (Actias luna), a member of the Saturniidae family, is unique in that it lacks mouthparts. Due to this absence, the adult Luna Moth cannot feed, preserving its energy exclusively for reproduction.
A few key features of the adult Luna Moth are:
- Large size: 3-4.5 inch wingspan
- Seafoam green to yellow color
- Long tails and eyespots on wings
Another notable characteristic of the Luna Moth (Actias luna) is its incredibly short lifespan. With only 7 to 10 days to live as adults, their primary focus is on reproduction. During this time, the female Luna Moth will release pheromones to attract a male for mating.
Some interesting facts about the Luna Moth lifespan:
- The total life cycle lasts 6-8 weeks
- The caterpillar stage lasts 3-4 weeks
- Pupal stage lasts 2-3 weeks
- Adult stage lasts 7-10 days
The Luna Moth’s name is derived from the Roman moon goddess, Luna, fitting for its nocturnal lifestyle and striking, moon-like coloration.
Over the years, our website, whatsthatbug.com has received hundreds of letters and some interesting images asking us about these insects. Scroll down to have a look at some of them.
Letter 1 – Luna Moth
Luna Moth in WI
A friend of mine took this picture of a Luna Moth in Mount Horeb, WI (Dane County). I was very excited when she showed my the shot as I thought WI was out of their range. After a bit of research, I found that there have been a few sightings in the southern part of the state, including Dane County. However, I thought it was rare enough that you might be interested….plus, it was out during the day. I’m hopeful now that I might see one myself someday!
PS I’ve become addicted to your site…ever since I used it last Summer to ID Box Elder nymphs.
We are thrilled to hear you are such a fan. Thank you for adding to our wonderful Luna Moth archive.
Letter 2 – Luna Moth
The ubiquitous Luna Moth…
Bossier Parish, Louisiana. Felt it was notable for the fact I had such strong sunlight for the shot…on a macro lens digital camera… …I see you have plenty to choose from…thought I’d throw one more in…
Thanks for your photo of a beautiful Luna Moth.
Letter 3 – Luna Moth
How wonderful to find your site!! I was searching for more information about the Luna Moth. I have a picture that I took back in Aug. 2005 that I treasure. It is hard to describe how excited one can get when you see something in your yard that is so incredibly awesome as this beauty. All you can think of is "GET the CAMERA" I did & I got several shots that bright sunny day In my quest to find info later, I learned what I had seen, and that it is a very rare sighting, so I felt especially fortunate indeed. But now that I have found your site; not only do I have more accurate info, [Thank you for that] but I see that you have "LOTS" of pictures during 2005 & 2006 So I guess my question is this- Just how ‘rare’ is rare and are these beautiful creatures perhaps increasing in population? Wouldn’t that be COOL ?!! Going to try again- maybe this time I will get it right when I send you the photo. [sending more angle shots from that day as well] Thank you for your time& patience.
Thank you for resending your photos. We have seen information listing the Luna Moth as endangered, but in a true sense, all life on the planet is endangered. Sightings on some years might be more rare than on other years, and recent years seem to have shown an increase in sightings, though that might be due to the ubiquity of the digital camera and the universal access to the internet. Nonetheless, your sighting is a wonderful event that you may never have a chance to repeat, so you have the photos to reinforce the memory.
Letter 4 – Luna Moth
I know you are overwhelmed, but can you help me out with this bug. It is about 5 inches across and very flat.
Dennis Mc Donald
The Luna Moth is probably our most unmistakably unique native moth.
Letter 5 – Luna Moth
We saved this very pretty, very large, moth from being dinner for my chickens. Could you help me indentify it? Thanks,
We have been posting images of Luna Moths on our homepage since May, and it always makes us a bit sad to remove a beautiful image to make room for new letters, but just like a missed bus, another comes along soon enough. We are happy to have your interesting angle on our homepage for a few days before it takes a more permanent place on our Luna Moth page.
Letter 6 – Luna Moth
I finally found out what this beautiful green moth was on your website. I live in Tampa, Florida and this beautiful creature was on my house for 24 hours or so, on June 3, 2006. I’ve never seen one before in my life. How beautiful!!!
WE just removed an old photo of a Luna Moth from our homepage, so we are happy to have your photo to place there.
Letter 7 – Luna captured on Cel Phone
I live in Dutchess County, NY, and today I spotted my first Luna Moth (a male), hanging out on my screen door. I tried to relocate it to a nearby tree, but it wanted none of that. In fact, when I approached it with my camera, it got so scared it started shaking. Nonetheless, I managed a few pictures of it anyway, albeit with my cameraphone, and thought I’d share them with you since I just discovered your wonderful site. I should start one for birds, although it’d be far less challenging!
P.S. There are two images in this zip file: one is of the moth on the woodchips under the bush and the other is when it was on the concrete step in front of my door.
Thanks for the photo.
Letter 8 – Hoax?
Your web site appears to be serious but when I clicked on the luna moth the picture does not appear right. Before I share your site with others please checkout the photo. Maybe someone hacked into your site.
If you go to the cryptozoology.com site, you will understand why we had some fun with this one.
Letter 9 – Indian Moon Moth
Hi, thought u arent savvy of Indian Luna Moth.But its the discolouration that bothered me. Are they whithered or what? Is it stiil too young to develope its slight green colour?
The overall color balance of your image is blue. Your image looks blue because of the color balance (shady light source). Thanks for sending us your Indian Moon Moth, Actias selene.
I am immensely proud that u have posted my luna moth photo at your site.. Nowadays I am telling my friends here in kerala, India to surf your fabulous site. Luna Moths are the real pick of the site.. Earlier u people have helped me in identifying the japanese Oak Silk and Bagworm moths. Keep up the good work for the better understanding of diverse nature.. Regards
Letter 10 – Indian Moon Moths
I was just looking through some of those!! I saw you had many unidentified slug caterpillars, which i’ve never seen or heard of! But some of those Automeris species look familiar (some of them were from a differentley described genus), though I dont remember the exact species names offhand. I’ll look through them all and if I see any I know of, I’ll get back to you; I have a few textbooks with some detailed plates. In the meantime, attached are some pictures of Indian moon moths that I raised! The big one on the screen is a female, 7 inches in wingspan! the smaller one on the gold rug is a male.
Thanks for sending us your images of Indian Moon Moths, Actias selene. They will find a permanent home in our archives on our Luna 2 page, even though they are relatives of the North American species.
Letter 11 – Giant Silkmoth from China
Subject: Chinese Moth
Location: Suzhou, China
April 14, 2013 8:42 pm
Hi Bugman !
We found this beautiful moth in Suzhou, China at a Skateboard park and would love to have it identified. Size is not easy to see from the photograph but wingspan was approximately 12cm.
Thanks for your help !!
We are rushing to post this and we are not certain if we have the correct species. This moth looks very much like the North American Luna Moth and we are guessing they belong to the same genus, Actias. Kirby Wolfe’s website lists two species in the genus in China, and this looks like Actias felicis.
Thanks very much for your fast reply – my children were very excited to find this moth and it’s great to be able to tell them exactly what it is!! All the best and keep up the good work with the site. Best Regards
Letter 12 – Luna
Subject: ID please
Location: Roanoke, VA
June 29, 2014 2:21 pm
Hi. This moth-butterfly alit on the siding of a house. Look familiar?
The Luna Moth is unmistakable among North American insects, and it is the only member of its genus found in North America, though relatives that look similar are found in other parts of the world, including the Moon Moth of India and Actias rhodopneuma from Thailand.
Letter 13 – Freshly Eclosed Luna Moth
Subject: What is this?
Location: Williamsburg, virginia
August 7, 2017 4:30 pm
This bug is on my fence. Its about an 2 inches
This is a newly eclosed female (indicated by the shape of the antennae) Luna Moth, and she probably emerged from a cocoon that was mixed up with the dried, fallen leaves barely visible beneath your fence. If nothing goes awry, because newly metamorphosed insects are especially vulnerable to predators, her wings will enlarge and harden enabling her to fly. She will release pheromones and attract a mate to help perpetuate the species.
Letter 14 – Luna Moth
Subject: Luna Moth
Geographic location of the bug: VERONA, PA
Time: 01:19 AM EDT
Your letter to the bugman: My first Luna Moth sighting of the year! On the wall at work tonight!
How you want your letter signed: Rhiannon
Thanks for your comment and your submission. How marvelous that this was your first Luna Moth sighting of the year, indicating that you have had sightings in years past. Many of our readers, even those who live within the range of the Luna Moth, are never fortunate enough to experience a sighting of this glorious insect. Alas, the artificial light under which this image occurred has desaturated the lovely green color of the Luna Moth.
Letter 15 – Luna Moth
Subject: Luna Moth
Geographic location of the bug: Pine Grove Mills, PA
Time: 04:21 PM EDT
Your letter to the bugman: Hi bugman. On the side of mom’s house today July 9. 2019
How you want your letter signed: CC
Thanks so much for sending in your image of a Luna Moth. We never tire of posting beautiful images of this gorgeous moth.
Letter 16 – Luna Moth
Subject: Luna Moth 2.0
Geographic location of the bug: Woodsfield Ohio
Time: 03:05 PM EDT
Your letter to the bugman: Found this guy in my front yard today. Looks like he’s been through hell with the birds around here. He’s still a wonderful site to behold and I’m glad that the Luna’s around here have decided to shelter around my house.
(No i.d. Necessary reposted here to attach pic)
How you want your letter signed: Xero
Thanks so much for sending in your image of a very tattered female Luna Moth. Her narrow antennae indicate she is a female. We hope she mated and laid at least some of her several hundred eggs. Daniel is currently in Ohio and he hopes he has an opportunity to observe a Luna Moth in the wild, something he has never yet experienced.