The North American moon moth! (Actias Luna)

Insects for Fun!

This week we look at a very special giant silkmoth that comes from North America (Luna moths). The species is incredibly iconic, and there are many different meanings for it across various cultures. The best part is you can also raise them relatively easily as a pet!

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Transcription:

Welcome back to episode 60 of Insects for fun! I wonder what we should do for episode 100… I’ve also been thinking of adding other arthropods into the mix. What do y'all think? Let me know in the comments section either on IG, FB or in your podcast player. Also when this episode is released I’ll be on a flight back to Japan from the states, so I’m currently writing this weeks in advance. Recently we have had some moon viewing stuff going on in Japan, and I figure what better time than to talk about one of my favorite moths, the Luna moth.

Lunas are in the giant silkmoth family Saturniidae and the genus is Actias. There are actually quite a few species of moon moths in this genus, but not all of them are green like the well known luna. Fortunately in Japan the two different species we have are quite similar to the luna, and I’ll be trying my hand at raising one of them next summer.

Actias luna have large and gorgeous pastel green wings with big fluffy white bodies, and one eye mark per wing. The wingspan can reach 5 inches across and also have long tails which only further adds to their celestial appearance. The name Luna is actually in reference to the roman moon goddess Luna, but this was not always their name! The initial name for these was actually plumata caudata which translates to feather tail, and these moths were the first American giant silk moths to be documented in literature. The name was later changed by Linnaeus in 1758. There are actually quite a few giant silk moths with mythological names like Polyphemus, Prometheus and Atlas for example, but the majority of them are brown or a variation of it. The Luna moth can only be found in North America, and not even the entire continent either. These moths chose a side and thankfully for me it was the east! You can find lunas from Canada down to Florida but they stay east of the great plains, and in Canada they’re found from southern Saskatchewan to Nova Scotia. I’ll never forget the first time I saw one, and thankfully finding them doesn’t seem to be all that difficult if you know where to go.

Luna moths are quite partial to forested areas but what kind of plants they eat is dependent on their geographical location. For example the caterpillars we have in Vermont love eating Birch, but I’ve also been successful at raising them on black walnut as well. Other common hosts include Butternut, Sumac, Sweetgum in the south, Alder, Beech, wild cherry and even persimmon. The time of year to find adult moths also varies heavily by location as well and this is because warmer weather allows them to have multiple breeding seasons unlike the northern populations. In Northern Vermont we have one generation a year and our Lunas start coming out of their cocoons in late May. In the south it’s not uncommon to have 2 or three generations in a year depending on the state. Massachusetts for example is right under VT but can have a partial 2nd generation.

The caterpillars are also an incredible green, and they can get pretty big. The 5th and last molt reaches a size up to 3inches or 7.5 cm and has red dots sprinkled over its back. What’s unique to these compared to other giant silkmoths is that the entire caterpillar actually turns red right before it begins making a cocoon. At least that’s been my experience but I’ve also read that some of them turn brown or orange as well. But it's not the color or the ability to change colors that makes Luna moths interesting or the moths in the genus Actias. It’s actually the tails on their wings that have attracted a lot of attention. Some species in the genus actias have tails on their wings that reach 12cm in length, and that’s just the tail section! I can’t tell you these are the only moths with long tails on their wings but I can definitely say they are one of a handful, and the reason they have these tails is to protect them from bat attacks! Bat’s rely on echolocation to find their prey, and it's one of the reasons why they fly in close quarters to people fishing in the evening. The sounds bouncing off the water from lures being whipped draws them in which can be intimidating I gotta say, and the tails on moon moths disrupt the air waves in a way that confuses bats into missing the body of the moths entirely. In fact studies found that Brown bats are near 50% more successful at hunting lunas when their tails are missing. The tails on these moths are never straight either. At the very base of these tails the wing has a slight curve which catches air in a way that changes the source location of their sounds. For example a moth with no tails is essentially a flying target because the sound originates from the body, but a moth with the tails has its sound point from further below the main body.

Some people had previously questioned whether the tails were used for attracting a mate but uh ima be real with you. These moths could not care less about what their partner looks like. Some of them are so blind that they try to mate with anything. And that brings me to my second point. The female luna moths like all saturniidae release a pheromone to lure males, and half the time aren’t even looking in the direction of where males are flying in from. The males have to initiate everything after the female starts calling, so whether or not she lays fertile eggs is dependent on the health or age of the male as well as how closely related they are. Generally speaking the moths have different times of day when they start flying based on gender which is a form of control against inbreeding. Some males won’t even recognize their siblings' pheromones.

Now because luna moths are relatively famous as far as insects go, there are cultural and spiritual meanings tied to the moth. One super simple one is transformation and rebirth but that’s like a copout meaning given to any insect with relevance that has multiple life stages so we aren’t gonna focus on that. The other meanings though have more to do specifically with the luna moth like inner guidance and intuition. I don’t know much about chakras but I guess a soft green color is supposed to represent the heart chakra and is connected to our ability to connect to our inner wisdom, and instincts. The other meaning which I really like connected to these moths is divine femininity. Its gentle temperament and grace links to compassion and intuition often associated with a woman’s instincts.

In some native american folklore the luna moth is associated with rebirth and spiritual guidance. Similarly in celtic mythology the luna moth is associated with the fae, and is seen as a symbol of rebirth and magic. It really does seem that throughout the world and history these moths have held a special place in the eye of those who see it.

If you would like to raise luna moths it is totally possible to get eggs or cocoons. Especially if you live in the United States, but people can order eggs and cocoons from the US in other countries as well. You just have to be mindful of the host plants you have around. If you simply google luna moth eggs or cocoons for sale you find many different people willing to sell and ship you these insects. They’re also sometimes used in elementary schools as a fun classroom pet to showcase metamorphosis. If you want the cocoons to stay dormant during the winter it’s important that you make sure the insects came from natural conditions. The amount of light they received as a caterpillar dictates whether or not they are going to diapause or sleep during the colder months, and it’s also important that you leave the cocoons outside. They need to stay synced to the natural temperatures and humidity of their environment. Some people put them in the fridge but if you do this the container needs to be air tight because they will 100% dry out and die otherwise. They don’t require much oxygen at all while they are in this state of sleep, but if you’re concerned you can open the container and give them a slight misting before putting them back in the fridge. Too much water and they will suffocate or get moldy. Also if you live in a colder climate I definitely recommend finding a vendor who lives in a similar place. You don’t want souther cocoons coming out early on you.

This concludes today’s episode on Luna moths! I may come to this topic again in the future when I have more time on my hands, but for now hopefully this is enough, thank you as always for listening and if you want to support the show you can rate it and leave a review! Or if you need more insects for fun content or want to further support me and the podcast you can head over to Patreon.com/insects for fun to get bonus episodes, ad free episodes, vlogs, and some new things I’ll be working on as well.