How to Tell if a Luna Moth is Dying: Spot the Signs Now

Luna moths are fascinating creatures known for their distinctive appearance, featuring lime-green color and long tails. While it’s intriguing to observe these moths, it’s equally important to know when they might be in distress. Noticing signs of a dying luna moth can help understand their life cycle and potential threats to their wellbeing.

In this article, we will explore how to tell if a luna moth is dying by examining various indicators. These can include changes in physical appearance, behavior, or whether the moth is nearing the end of its natural life. Recognizing these signs can aid in educating ourselves and appreciating the beauty of luna moths even more. Stay tuned to learn about these fascinating insects and how to understand their health conditions better.

Understanding Luna Moth Life Cycle

Egg Stage

The life cycle of a Luna Moth begins with the egg stage. Female moths lay their eggs on the leaves of host plants for the caterpillars to feed on after they hatch. Some common host plants include:

  • Walnut trees
  • Hickory trees
  • Sweetgum trees

Larval Stage

In the larval stage, caterpillars spend most of their time eating and growing. Luna Moth caterpillars:

  • Are bright green
  • Have yellow bands on their segments
  • Molt multiple times before reaching pupal stage

Pupal Stage

The pupal stage is a critical part of the Luna Moth’s metamorphosis. During this stage:

  • Caterpillars spin a cocoon
  • Transformation into an adult moth occurs

Adult Stage

Adult Luna Moths have several distinct features, including:

  • A pale green color
  • A wingspan of 3-4.5 inches
  • Long tails on their hindwings
  • Eyespots on their wings

Luna Moths’ life cycles vary depending on their location:

Location Generations per Year
Michigan 1 (univoltine)
Ohio Valley 2 (bivoltine)
Southern US 3 (trivoltine)

While Luna Moths are beautiful creatures, they are short-lived in their adult stage, lasting only about one week.

Recognizing Signs of a Dying Luna Moth

Physical Changes

  • Color change: A dying luna moth may exhibit a pale or lime green color instead of its usual vibrant green.
  • Wing damage: The moth’s long and delicate wings might show signs of wear, such as ragged edges or damaged tails.

Behavioral Changes

  • Lethargy: A dying luna moth may become less active and lie on its side, unable to fly or move around.
  • Unresponsiveness: A healthy luna moth usually responds to external stimuli, like light and touch, while a dying one might become unresponsive.
Feature Healthy Luna Moth Dying Luna Moth
Color Vibrant green Pale or lime green
Wings Condition Intact and fully extended Ragged and damaged
Activity Level Active and responsive to touch Lethargic and unresponsive
Position Upright or flying Lying on its side, unable to fly

Factors Influencing Luna Moth’s Health

Natural Predators

Luna moths face various natural predators that can pose a threat to their health and survival. Some examples of these predators include:

  • Bats: Known to consume moths, including Luna moths, during their nightly hunting routines.
  • Owls: These nocturnal birds often prey on a variety of insects, such as Luna moths.
  • Fiery searcher ground beetles: These beetles are known to eat the caterpillars of Luna moths.
  • Bald-faced hornets: These insects attack and feed on Luna moth caterpillars.
  • Parasitic wasps: These wasps lay their eggs in the larvae of Luna moths, often leading to the moth’s death.

Environmental Threats

Luna moths can also be affected by various environmental factors, such as:

  • Pesticides: When these chemicals are used to control other pests, they can inadvertently harm non-target insects like Luna moths.
  • Pollution: Air and water pollution can lead to the contamination of the moth’s natural habitats and food sources.
  • Habitat loss: Destruction of natural habitats can lead to a decline in Luna moth populations, as they require specific plants to lay their eggs and feed as caterpillars.
  • Habitat degradation: Changes in the quality of the moth’s habitat, such as deforestation and urbanization, can reduce the moth’s ability to thrive.

Pros and Cons of Using Pesticides

Pesticides can be effective in controlling unwanted pests, but they can also have unintended effects on benign or beneficial insects like Luna moths. Here’s a comparison table showing the pros and cons of using pesticides:

Pros Cons
Controls target pests Can harm non-target organisms
Reduces crop damage Can lead to pesticide-resistant pests
Can help maintain food security Can contaminate soil, air, and water

In conclusion, factors such as natural predators and environmental threats play a significant role in the health of Luna moths. Being aware of these factors can help in making informed decisions to protect and conserve these fascinating creatures.

Protecting and Supporting Luna Moths

Creating a Moth-Friendly Habitat

Luna moths, also known as American Moon Moths, are among the most beautiful moths in North America. To help these lime green, giant silkworm moths thrive, create a moth garden that encourages their survival.

  • Plant host plants: Luna moths mostly rely on birch, white birch, and other forested trees as host plants.
  • Provide dark areas: Luna moths rely on their camouflage for protection. Ensure there are dark areas within your garden where they can hide.
  • Limit artificial lighting: Street lights can disrupt moth behaviors. Minimize artificial lighting around your garden.

Raising Awareness and Conservation

The following steps can aid in raising awareness and conservation for the luna moth species:

  • Educate others: Sharing knowledge about luna moths, including their habitat needs and unique features such as their antennae and tail, can help protect their populations.
  • Advocate for forest conservation: As luna moths inhabit forested areas in the United States and Canada, supporting the conservation of these areas can significantly boost their survival.
Aspect Luna Moth Other Insects
Color Lime green Varies
Endangered status Not endangered Varies
Generations per year 1-3 (climate-based) Varies
Lifespan 1 week (as adult) Varies
Silken cocoon Yes Some

By implementing moth-friendly habitats and raising awareness, we can help ensure the luna moth species thrives in North America.

Reader Emails

Over the years, our website, 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


After researching to find out what name this moth is from your website, I wanted to say, this Luna Moth was on my screen door here in Sault Ste Marie, ON. I was curious to know how far north do these Luna Moths go? I see your recipients are from the USA, and wonder if this one has traveled too far?
Have a good day,
Helga MacKenzie
Sault Ste Marie, Ontario Canada

Hi Helga,
Thanks for sending us your Luna Moth image. Luna Moths are quite common in Maine and they also range into Southern Canada.

Letter 2 – Luna Moth


What is it? It’s gorgeous!!!
Last year I sent a pic of a Giant Inchneunom that you really liked and added to you website. Here’s anew one of a bug we don’t ecognize. Please advise Thanks,

Hi Ian,
This is a Luna Moth. It is a striking insect that cannot be easily confused with any other North American species. If you had scrolled to the bottom of our homepage, you would have gotten your answer.

Letter 3 – Luna Moth


Luna moth
Love your website. Just saw this a couple minutes ago next to my back door. I live in Birmingham, AL and thought I’d give you another few photos to add to your collection of Luna Moths.
Cheers, Mari

Hi Mari,
Your Luna Moth is lovely.

Letter 4 – Luna Moth


green moth?
My children and I Iove to look at your site. Thank you for putting it together for the benefit of all! We found a lovely green caterpillar a couple of weeks ago and brought it inside to watch for the day. Before we knew what was happening, it had turned into a Chrysalis using some beet greens I had placed in the container. Well, two weeks later, we found "Rosemary" the caterpillar had turned into "Rosemary" the moth! We gently moved her back out of doors and took this picture. Can you give us any more information about "Rosemary?"
Many thanks.
Tipps Family
Houston, Texas

Dear Tipps,
We have been getting numerous requests for Luna Moth identifications and have been running images constantly on our homepage for over a month.

Letter 5 – Luna Moth


We just found this Luna moth today 5/2 in Knoxville, TN and wasn’t sure what it was until now.

Hi Reba,
We never tire of receiving gorgeous photos or this gorgeous species.

Letter 6 – Luna Moth


Larry the Luna Moth
Hi folks at whatsthatbug! We wanted to show you our friend Larry, who finally emerged from his crysalis yesterday. We bought the crysalis at Butterfly World in South Florida. After it emerged we thought Larry was lonesome and needed to mate for his short life as a Luna Moth. We took him back to Butterfly World today to release him.
Alex and Lori Bale

Hi Alex and Lori,
Thank you for your wonderful story. We are sure you made Larry’s life short and sweet.

Letter 7 – Luna Moth


Luna Moth
My 4-year-old son and I found this Luna Moth outside our window this morning. I thought you might appreciate seeing really is gorgeous!
Boyds, MD

Hi Barbara,
We know it is spring when the Luna Moth photos begin to arrive, just like we know summer is approaching with the Dobsonflies, and fall with the Hickory Horned Devils.

Letter 8 – Luna Moth


luna moth
I just took this snapshot two days ago in Georgia.

Hi Caesar,
You are too modest. Your photo is very beautiful and we are proud to display it.

Letter 9 – Luna Moth


Thank you so much. I am attaching 3pics of a Luna moth. hope you enjoy them – looking it up is what led me to your site (google). Again you are amazing, thanks

Hi again Kathy,
Thanks for the follow-up letter, and it brings up an interesting possibility. Luna Moth Cocoons are nearly always found on the ground, but we have heard that sometimes they remain attached to trees. The Luna Cocoon looks very similar to the Polyphemus Cocoon. Perhaps, just maybe, your cocoon is a Luna Moth Cocoon.

Letter 10 – Luna Moth


another luna moth for your collection
I live in The Woodlands, Texas, just north of Houston. A few minutes ago I saw this guy flutter to the ground, presumably to catch some sun – we had some early warm temps, but it’s cooled down again! He seems to be a little battered around the edges, but a beautiful specimen nonetheless.

Thanks for sending in your photo Tristyn.

Letter 11 – Luna Moth


Luna Moth
I’m attaching 2 photos of a beautiful Luna Moth that came to our window last evening. I was able to get a shot of the underside from inside the room. It did not look like you had posted any photos from that angle.
Scott Broome

Thank you Scott.

Letter 12 – Luna Moth


I found this thing on my backdoor, this thing was huge!
Apopka, FL.

Hi Sean,
We never tire of seeing photos of the Luna Moth.

Letter 13 – Luna Moth


what type of moth is this?

Hi Robert,
We are thrilled to post your image of a Luna Moth so early in the season. We get most images in May and June. This is one of our favorite insects and we have an entire page devoted to this beauty.

Letter 14 – Luna Moth


Ghost Moth
Hello Bugman,
I wish I could say I was a bug girl, but I just can’t figure out what this peculiar bug is. I am assuming it is a moth, but am unsure of what type. We have seen a few of these in the past 2 years and a couple of “hummingbird moths”. The hummingbird moths tend to catch me off guard and I do scream quite loud (tend to be about three fourths (3/4) the size of a dollar bill.) I reside in Maryland ( Ellicott City area), and have been stumbling upon a lot of strange critters. I hope you can help, and if so I may have another picture to send you. It is of a black caterpillar with gray/white fur all over it. Reminds me a bit of a baby chimpanzees finger(s) with medium white hair all over it. We found about 200 + on our patio when we came home from work 4 days ago (28 July 05). I gathered them up in a few cans freaking out because they were trying to borrow in the ground and my dog’s fury bed. I have 3 caterpillars in a jar with dirt now. As soon as I put them in there they played possum for about a minute, and then immediately dug into the soil. One of them actually has his back facing one side of the jar. I see him wiggle around every once in a while. I will truly try and get a picture for you. I am very curious to see what they become. I have yet to find any info on the net that I feel is a definitive answer to what we were/are dealing with. All I can say is that the closest characteristics out there (personality and looks) is the Walnut Caterpillar. I am not sure if they would be in Maryland though. Hope you have some insight to my many curious questions, and I will keep you posted on my little science project in a jar. Thanks so much and I look forward to hearing from you soon,

Hi Rhiannon,
Your mystery moth is a Luna Moth and it can currently be seen starring in a television commercial for a sleep aid called Lunesta. We look forward to hearing more about your caterpillars when they develop.

Letter 15 – Luna Moth


not sure what kind of bug this is(pic enclosed)
I Live in Charlotte, NC and last night (5/09/05) my wife heard a thump outside our bedroom window, I looked and saw what appeared to be a bat, this was about 10"ish. This morning we noticed it was still out on the wall so I took some pictures. Enclosed find a picture, this was taken about twenty feet away from the insect. I asked a few people down here and no one knows what this bug is. It is freaken huge for a bug.
George Doscher

Hi George,
While 10 inches is a gross exageration, Luna Moths, what many consider the most beautiful native insect, can grow to almost 6 inches across. Thanks for the image. There is a new television commercial for a sleep aid that features the Luna Moth.

Thanks Dan,
Been looking it up now thru usgs web site, a friend called me and stated that he had one on his screen and it freaked him out….. as well…. I have been living here for like five years never seen them before…asked a few people here and no one knew what it was. By the by you have a cool web site…

Reader Emails


Reader Emails

Over the years, our website, 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 – Prepupal Luna Moth Caterpillar in Maryland


Prepupal Luna Moth CaterpillarSubject:  Salmon pink body with green head.
Geographic location of the bug:  Baltimore County, Maryland
Date: 08/06/2022
Time: {current_time} EDT
Your letter to the bugman:
Never saw anything like this one. Found this odd character on our driveway the other day (Aug 2022). Salmon pink body with green head. About 2-3″ long.  At first glance it appeared to be covered in sparkles but the photo reveals them to be small spikes. What’s this bug?
How you want your letter signed:  Curious

Prepupal Luna Moth Caterpillar
Prepupal Luna Moth Caterpillar

Dear Curious,
We are nearly certain this prepupal caterpillar is a Luna Moth Caterpillar which can be found pictured on BugGuide.  


  • Bugman

    Bugman aka Daniel Marlos has been identifying bugs since 1999. is his passion project and it has helped millions of readers identify the bug that has been bugging them for over two decades. You can reach out to him through our Contact Page.

  • Piyushi Dhir

    Piyushi is a nature lover, blogger and traveler at heart. She lives in beautiful Canada with her family. Piyushi is an animal lover and loves to write about all creatures.

2 thoughts on “How to Tell if a Luna Moth is Dying: Spot the Signs Now”

  1. so soft and so fluffy! moths are so fluffy and so soft! how come more people that are in to insects, don’t write more stories about them?! more people ought to be writing more stories about moths more! 😉 more fantasy type of stories of all kinds, people! write more stories about moths people! all kinds of stories about moths people! 😉 more moth fantasy stories, people! and caterpillars too! write more fantasy stories about caterpillars too, people! 😉


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