40 Fun Facts About Luna Moth

Which everyday activity can an adult luna moth never do, because of the way its body is built?

Eating is impossible because adult luna moths have only shrunken, useless mouthparts. They exist just long enough to mate and lay eggs.

The long, spinning hindwing tails of the luna moth evolved to fool which night-hunting predators?

Bats aim their sonar at the twirling tails instead of the body, striking them in about 55 percent of attacks. In tests, moths with tails survived far more often than clipped ones.

Once a luna moth leaves its cocoon as a winged adult, roughly how long does it have left to live?

About a week is all an adult luna moth gets, which is why this common species is so seldom seen. Every hour goes on finding a mate and laying eggs.

An animated luna moth fluttered through 2007 television commercials for which prescription sleep aid?

Lunesta shares its mascot with a field guide to the moths of eastern North America, which puts a luna moth on its cover. Both choices show how well loved the insect is.

The luna moth was honoured across the United States in June 1987 by appearing on what?

A postage stamp carried the luna moth in 1987, and the Postal Service chose it again in 2025 for a stamp made for odd-shaped envelopes.

Luna moths are strongly drawn to ultraviolet wavelengths; what urban problem is feared to disrupt their mating?

Light pollution from mercury vapor streetlamps is the chief worry, since the glow may keep luna moths from mating. Researchers fear it could thin their numbers in towns and cities.

What warning sound do luna moth caterpillars make with their mandibles when a predator attacks?

Clicking is thought to warn an attacker that worse is to come, and the sound reaches up into ultrasound. People can hear the lower part of it.

Male luna moths can track a female's scent from several miles away using which large, feathery body parts?

Antennae on a male are much longer and wider than a female's. He follows the scent upwind until he reaches her.

What markings, one on each of the luna moth's four wings, are thought to confuse would-be predators?

Eyespots on the luna moth are oval on the forewings and round on the hindwings. Each can carry arcs of black, blue, red or green.

What airborne chemical signals do female luna moths release at night to summon males from far away?

Pheromones from a luna moth female drew in only her own species in field tests with a synthetic copy. She perches on a food tree and waits to be found.

What colour is the hairy body of the luna moth, in contrast to its lime-green wings?

White hairs cover the luna moth's body, and a thick, deep-coloured band runs along the front edge of each forewing.

Luna moths live across the eastern United States; in which southern state can adults be found in every month?

Florida is warm enough for luna moths to fly all year, in as many as three generations. From Michigan northward there is only one generation a year.

Researchers found the ground beneath a roost of which birds littered with the wings of luna moths?

Owls prey on luna moths at night and leave the wings scattered under their roost. Every life stage of the moth is food for something.

Which naturalist gave the luna moth its lasting species name in 1758, replacing an older Latin label?

Carl Linnaeus renamed the moth luna, dropping a Latin name from 1700 that described its long tails. It was the first of its family from North America to enter the scientific literature.

The luna moth belongs to a family of some of the world's largest moths, commonly known as the giant what moths?

Silk gives the giant silk moths their name, though the luna moth's own cocoon is thin and single-layered. Its relatives include some of the largest insects alive.

In which life stage do luna moths wait out the winter, a dormancy that can last about nine months?

Pupa is the stage that sits out the cold, tucked inside a cocoon. Short days felt by the caterpillar are what trigger the long sleep.

After sounding a warning, what do luna moth caterpillars do to make an attacker back off?

Vomit from the caterpillar's gut is nasty enough to deter several kinds of predator. The warning noise is thought to announce that it is coming.

Which Asian member of the luna moth's family has forewing tips that resemble a snake's head?

Atlas moth wings can span 25 centimetres or more, over double a typical luna moth. Its Cantonese name means snake's head moth.

Which nut tree, whose leaves carry the insect-deterring chemical juglone, do luna moth caterpillars readily feed on?

Walnut leaves are laced with a toxin most insects avoid, yet luna moth caterpillars have gut chemistry that neutralises it. They make even more of the antidote on such a diet.

Which tree with star-shaped leaves and spiked fruits is a favourite food plant of southern luna moth caterpillars?

Sweetgum works so well for southern luna moths that breeders use it to rear them in captivity. Northern caterpillars often cannot digest it.

Which fruit tree of the eastern United States, bearing sweet orange berries, also feeds luna moth caterpillars?

Persimmon leaves are on the luna moth menu along with hickory and sumac. Caterpillars from one region may refuse a tree that another region's caterpillars thrive on.

The comet moth, a long-tailed cousin of the luna moth, lives wild only in the rainforests of which island?

Madagascar is the comet moth's only home, and the male's tails can trail 15 centimetres behind him. It ranks among the largest moths of its family anywhere.

The luna moth is named for the Roman goddess Luna; who was her counterpart in Greek mythology?

Selene was the Greek goddess of the Moon, as Luna was in Rome. Luna also gave English the words lunar and lunatic, from an old belief that the Moon could unsettle the mind.

Luna moth mating usually takes place in the first couple of hours after what time, once females have called in males?

Midnight marks the start of luna moth courtship, and a pair may stay coupled for several hours. The female begins laying her eggs the following evening.

When threatened, a luna moth caterpillar rears up its front end in a pose named after which mythical creature?

Sphinx is the name for the pose, which may make the animal look less like a caterpillar to a hunter. Its leaf-green colour is its first line of defence.

Luna moths belong to the insect order Lepidoptera, a name built from the Greek words for wing and what else?

Scale is the other half of Lepidoptera, because tiny overlapping scales cover the wings like shingles. They are the powder that rubs off on your fingers.

The luna moth's range across the United States stops at the eastern edge of which vast region?

Great Plains country marks the western limit, and east of it the luna moth lives in every state from Maine southward. It is also found across southern Canada.

Which tan cousin of the luna moth is named after the one-eyed Cyclops of Greek myth?

Polyphemus moth caterpillars look so like a luna moth's that the two are easily confused. The adult is tan, with a wingspan of about six inches.

Just before spinning its cocoon, a bright green luna moth caterpillar may turn which colour?

Reddish-brown marks a caterpillar ready to transform, and it also flushes out its gut first in what is known as a gut dump.

What is the name of the insect body fluid a newly emerged luna moth pumps into its crumpled wings?

Hemolymph, the insect version of blood, is pumped from the swollen abdomen into the wings. The moth must then wait two to three hours for them to dry and harden.

Luna moths weaken their cocoons from inside using cocoonase, which is what kind of substance?

An enzyme that digests protein, cocoonase softens the cocoon so the moth can break out. Luna moths are unusually lively inside, wriggling noisily when disturbed.

A European parasite that now attacks luna moths was released in the United States to control which invasive moth?

Spongy moth caterpillars strip forests, so a parasitic fly was imported from 1906 to kill them. It turned out to attack more than 200 other species too.

Unlike the stingless luna moth caterpillar, which related moth's caterpillar is armed with venomous spines?

Io moth caterpillars release a painful venom at the slightest touch, while a luna caterpillar's spines do not sting. The Io is named after a mortal lover of Zeus.

Later summer generations of luna moths in the South are tinted more towards which colour than the spring brood?

Yellow tones mark the later broods, while spring moths are a deeper green with purplish wing edges. Northern moths lean more blue-green.

What do entomologists call the final winged adult stage that a luna moth reaches on leaving its cocoon?

Imago is the term for the winged, sexually mature adult, the only stage of a luna moth that can fly or breed. It emerges with its wings small and crumpled.

A luna moth caterpillar passes through five growth stages separated by molts; what is each stage called?

Instar is the name for each stage between molts, and a luna moth caterpillar spends about four to ten days in each. It sometimes devours its own shed skin.

What does an emerging adult luna moth use to tear a circular exit hole in its cocoon?

Spurs on its thorax, near the base of the front wings, do the cutting as the moth twists about inside. They are serrated and made of tough chitin.

At what time of day do luna moths usually emerge from the cocoon, leaving hours for their wings to dry before flying?

Morning emergence gives the wings a full day to expand and harden before the night's flight. Males usually appear several days ahead of the females.

At the northern edge of their range, luna moth caterpillars most often feed on which pale-barked tree?

Paper birch, also called white birch, is the mainstay in the far north, where luna moths raise just one generation a year.

The luna moth's Canadian range stretches from Nova Scotia west to which province?

Saskatchewan is the western limit in Canada, where the luna moth has only one generation a year. Adults there take wing in late May or early June.