Skip to main content

Luna moth

A stunning luna moth, Actias luna, slowly dries and unfurls. I had a short hiatus yesterday, in between leading groups on explorations in northern Michigan's Presque Isle County. So Nina Harfmann and I headed over to the shores of Lake Huron and some interesting alvar habitats full of unusual plants. Nina glanced down, and spotted the luna hanging from a twig. It had just emerged from its cocoon and was not yet fully expanded.

What a face! This is a male, as can be told by the large feathery antennae. We gently picked up the twig, which was nearly in the path, and positioned it for better photos. After a female American Redstart seemed to show undue interest in us and the moth, we ended up carting the luna safely out of sight and into a well protected nook so it could continue its transformation in peace.

One doesn't often stumble into lunas, and I felt especially fortunate to see one yesterday. My Columbus Dispatch column, Nature, ran the same day, and you can read that and see what the subject was, below:

The Columbus Dispatch
Sunday, May 20, 2012

Jim McCormac

Luna: big, beautiful moth

The world of moths is vast and underappreciated. Many people notice these creatures of the night only as fluttering brown wraiths clouding around the porch light. Yet these seemingly bland insects are among the most important animals in nature. For every adult moth that we see, scores of caterpillars — which ultimately become moths — perish. Moth caterpillars are a vital food source for legions of songbirds, wasps, beetles and other predators. Only a tiny percentage reaches the flighted stage. Even after the moths spread their wings, bats and birds such as flycatchers eat them.

Ohio is moth-rich; approximately 2,500 species occur in the state. Most moths won’t win any beauty contests, and few people other than hard-core entomologists pay them any mind.
But there are lepidopteran luminaries so beautiful that they would stop anyone in their tracks.

Foremost among the ranks of gorgeous moths are the giant silkworm moths of the family Saturniidae. There are only eighteen species of these flashy jumbos in Ohio, and all of them are eye-catchers.

The biggest silkworm moths are bat-sized, such as the cecropia with its 6-inch wingspan. Not far behind in size is the luna moth, a creature so stunning that its image is often reproduced, making the luna the most recognizable of North American moths.

A luna begins life as one of up to 300 eggs deposited by a female moth on an appropriate host plant. Suitable fodder includes tree species such as beech, cherry, hickory and walnut. After 10 days or so, minuscule caterpillars pop from the eggs and begin to feed on leaves. Every week, the caterpillar casts off its skin and emerges a bit larger. These growth stages are termed instars, and a luna caterpillar goes through five instars before reaching maturity. At that point, it is a glorious 3-inch lime-green sausage with bearlike grasping legs, ornately marked with orange dots and bristling with stiff hairs.

The mature caterpillar will soon fashion a cocoon, and late-summer luna hatches spend winter in this state. Earlier-season luna broods spend two weeks undergoing a remarkable transformation from caterpillar to moth within the cocoon. On the fateful morning, the moth wriggles free of its cocoon and begins a brief process of expansion by pumping fluid through its wings and body.

Voila! The result is a moth of staggering beauty. An apple-green luna is a sight not soon forgotten. Its massive forewings are trimmed in purplish-brown, and the hindwings feature stunning tail streamers that are twisted like confetti. How could such a showy animal hide from predators? Spot a luna dangling from a branch and the answer is apparent. The moth is a consummate plant mimic, its purple forewing edge resembling a twig with dangling buds, and the green wings are leaves.

It seems a crime that such an intricate creature lives but a week. Adult lunas exist only to mate and deposit eggs. They lack functional mouthparts and don’t eat. Males possess large fernlike antennae filled with sensitive receptors more acute than a bloodhound’s nose. They can detect the female’s airborne pheromones from a mile or more. After rendezvousing at night, their task is complete, and another cycle of gorgeous but all too ephemeral moths are set in motion.

Naturalist Jim McCormac writes a column for The Dispatch on the first and third Sundays of the month. He also writes about nature at

To learn more
A wonderful new moth book has just emerged: the Peterson Field Guide to Moths of Northeastern North America (Houghton Mifflin Harcourt, $29) by David Beadle and Seabrooke Leckie. It covers almost all of the species that one could expect to find in Ohio. Plenty of excellent photos are packed into its 600-plus pages.


Anonymous said…
I love Luna Moths and have raised a few thousand over the years. I send them to one of the local elementaries in the spring so they can watch them hatch. One of the coolest things about the luna moth is that you can hear it "scratching" to get out of the coccoon and then watch it hatch. Awesome! Lori Hall
Sharkbytes said…
I used to see them often as a child. Hardly ever as an adult.
Anonymous said…
I actually never saw one until today, going through Rite Aid I saw it on the wall. It was huge! Beautiful and I had no clue what it had lovely antenna that looked like feathers or fern plumes. He was injured as his beautiful tail was gone....I got a video and some pictures, a never forget moment for my guy and I. He flew off, hopefully to mate!! I live in TOledo Ohio

Popular posts from this blog

The Pinching Beetle, a rather brutish looking bug

The world is awash in beetles, and they come in all shapes and sizes. Few of them can match the intimidation factor of a Pinching Beetle, Lucanus capreolus, though. Those formidable looking mandibles look like they could slice off a finger.

Today was one of those coolly diverse days. I started off down in Fayette County, visiting the farm of a friend. He has restored about 25 acres of wetlands, and the response by the animal community has been nothing short of phenomenal. Blizzards of dragonflies of many species, amphibians galore, and nesting Blue-winged Teal, Pied-billed Grebe, and Sora. Among MANY other things. And all in a short two years. Add water and they will come.

Then, working my way home, I ducked into a Madison County cemetery that has a thriving population of Thirteen-lined Ground Squirrels, and shot images of our native prairie dog. Then, I stopped at a spot along Little Darby Creek, waded on in, and procured some pretty nice shots of various stream bluets and dancers. …

Calliope Hummingbird in central Ohio!

A hatch-year male Calliope Hummingbird strikes a pose. Small but tough, the hummingbird was feeding actively yesterday in 39 F temperatures. It frequents feeders and gardens at a home in Delaware County, Ohio, about a half-hour north of Columbus.

Fortunately, the wayward hummer appeared at the home of Tania and Corey Perry. Tania is a birder, and knew right away that the hummingbird was something special. For a while, the identification was up in the air, which isn't surprising. The Calliope Hummingbird used to be placed in its own genus, Stellula, but has recently been submerged into the genus Selasphorus, which includes Allen's, Broad-tailed, and Rufous hummingbirds. The latter two, especially, are quite similar to the Calliope in subadult plumage. Rufous is the default "vagrant" hummingbird here, with dozens of records and birds turning up annually. There is but one Ohio record of Allen's Hummingbird, from late fall/early winter 2009. Ditto the Calliope Hummi…

Snowy owl photography tactics - and things NOT to do

A gorgeous juvenile female snowy owl briefly catches your narrator with its piercing gaze. It's doing its Linda Blair/Exorcist trick - twisting its head 180 degrees to look straight behind. Owls have 14 neck vertebrae - double our number - which allows them such flexibility.

These visitors from the high arctic have irrupted big time into Ohio and adjacent regions, with new birds coming to light nearly every day. Probably 80 or so have thus far been reported in the state, and some of them have stuck around favored spots and become local celebrities.

I went to visit one of these birds this morning - the animal above, which was found last Friday by Doug Overacker and Julie Karlson at C.J. Brown Reservoir near Springfield. In the four days since its discovery, many people have visited as is nearly always the case when one of these white wonders appears near a large population center or is otherwise very accessible.

And as is always the case, people want to photograph the owls. And th…