98 Fun Facts About Butterflies

What are the four stages of a butterfly's life cycle, in order?

The four stages are egg, larva, pupa and adult; the caterpillar does almost all of the eating, and the winged adult of some species does not feed at all.

What is the primary function of a butterfly's proboscis?

Adult butterflies possess a long, straw-like mouthpart called a proboscis, which they uncoil to sip liquid foods such as flower nectar, water, and sometimes tree sap or rotting fruit.

What is the technical term for a fully developed adult butterfly?

Imago is the name for the winged adult stage of an insect; instars are the growth stages of the caterpillar, and nymphs and naiads are the young of insects that skip the pupal stage.

Which North American butterfly migrates thousands of miles to overwinter in Mexico and California?

Eastern monarchs travel thousands of miles to central Mexico each autumn, while the population west of the Rockies mostly heads for the California coast; the return north in spring takes several generations.

What is the protective casing called during the pupa stage of a butterfly?

Unlike moths, which often spin silken cocoons, a butterfly's pupa stage is typically called a chrysalis, which is a hardened, protective casing.

How many legs does an adult butterfly typically have?

Like all insects, butterflies have six legs, three pairs on the thorax, though in brush-footed species the front pair is so reduced that they appear to walk on four.

Which butterfly family is nicknamed 'brush-footed' because its members stand on only four legs?

Nymphalidae is the largest butterfly family and includes monarchs, admirals and fritillaries; their tiny front legs are held curled against the body and are useless for walking.

Which two body parts carry the chemoreceptors butterflies use to taste and smell?

Legs and antennae carry chemoreceptors; a female 'tastes' a leaf with her feet to check her caterpillars will be able to eat it before laying.

To which scientific order do butterflies and moths belong?

Butterflies and moths belong to the order Lepidoptera, a name derived from Greek words meaning "scaly wings," referring to their distinctive wing scales.

What are the bold circular wing markings that startle predators called?

Eyespots are circular wing markings that resemble a vertebrate's eyes; flashed suddenly, as by the peacock butterfly, they can startle a bird long enough for the butterfly to escape.

Queen Alexandra's birdwing, the world's largest butterfly, lives only in which country?

Females can top 25 cm across; the species is confined to Oro Province in eastern Papua New Guinea and was first collected there in 1906 by Albert Meek.

A butterfly's exoskeleton is built mainly from what material?

Chitin mixed with specialised proteins forms the cuticle, released from the softer epidermis beneath each time it moults.

What is it called when male butterflies crowd onto damp soil to sip salts and minerals?

Puddling males suck up salts and amino acids from mud, dung or carrion, apparently passing the nutrients to females as a nuptial gift during mating.

Unlike most moths, how do most butterflies hold their wings when perched?

Perched butterflies usually fold their wings together above the back, while most moths rest with wings spread out to the sides, though skippers and some geometrid moths break the rule.

What do butterfly larvae, or caterpillars, typically eat?

Butterfly larvae, known as caterpillars, are primarily herbivorous and spend nearly all their time consuming plant leaves to grow.

Heliconius butterflies are unusual among adult butterflies for feeding on what?

Most adult butterflies live on liquids alone, but Heliconius species collect pollen with the proboscis and digest its amino acids, which helps them live for several months instead of weeks.

What gives a Blue Morpho butterfly's wings their iridescent blue?

The Blue Morpho's colour is structural coloration: the wings hold no blue pigment, and microscopic ridges on the scales reflect blue light, producing an iridescence that shifts with viewing angle.

The antennae of most butterflies differ from those of most moths by having what feature?

That club is the basis of the old division of Lepidoptera into Rhopalocera ('clubbed horn', the butterflies) and Heterocera ('varied horn', the moths), though a few moths and skippers blur the line.

What term describes a non-toxic butterfly evolving to resemble a toxic species to deter predators?

Batesian mimicry, named after Henry Walter Bates who described it in Amazonian butterflies, is a harmless species copying a toxic one's warning pattern; if mimics grow too common, predators stop avoiding it.

How many distinct wings does a typical butterfly possess?

Four: a forewing and hindwing on each side, not hooked together as in moths but moving together through the friction of their overlap.

Unlike most moths, when are most butterflies active?

Most butterflies are active during the day: they are diurnal, basking in sunlight to warm their flight muscles before flying, whereas the great majority of moths fly at night.

Which butterfly family includes the whites and sulphurs?

Pieridae is the family of whites and sulphurs; their white and yellow colours come from pterin pigments, and the cabbage white, Pieris rapae, is the group's most familiar member.

What tiny structures cover a butterfly's wings, giving them their color and patterns?

Butterfly wings are covered in thousands of tiny, overlapping scales, which are modified hairs, responsible for their vibrant colors and intricate patterns.

What primary sensory function do a butterfly's antennae perform?

Smelling is the antennae's main job: they are covered in sensory organs called sensillae that detect airborne scents such as pheromones and nectar, and in most butterfly families they end in a club.

Caterpillars spin silk from glands that open on which body part?

Silk comes out through a spinneret on the lower lip, or labium; a caterpillar's silk glands are modified salivary glands, and it lays silk pads and lines before moulting or pupating.

How many antennae does an adult butterfly have?

A butterfly has two antennae, one on each side of the head; they are segmented, end in a club, and carry the sensory organs the insect uses to smell.

Which butterfly family contains the blues, coppers and hairstreaks?

Lycaenidae, the gossamer-winged butterflies, contains the blues, coppers and hairstreaks; many of its caterpillars are tended by ants, which drink sugary secretions from a gland on the caterpillar's back.

Which of these is NOT one of the three main sections of a butterfly's body?

Pedipalps are appendages found on spiders and scorpions, not insects; a butterfly's legs and wings all attach to the thorax.

Besides colour, what do the scales on a butterfly's wings provide?

Insulation: the overlapping scales trap a layer of air that helps the butterfly hold heat for flight; they also detach easily, which lets a butterfly slip free of a spider's web.

What was the painted lady formerly called in North America?

It was called the cosmopolitan butterfly, and the name fit: Vanessa cardui is the most widespread butterfly species, found on every continent except Antarctica and South America.

How long is the painted lady's multi-generation round trip from Africa to the Arctic?

The round trip is about 9,000 miles (14,500 km), relayed by up to six successive generations, none of which sees both ends of the route between tropical Africa and the Arctic Circle.

The red admiral caterpillar's primary host plant is what?

Stinging nettle (Urtica dioica) is the red admiral caterpillar's main food plant; the larva folds a nettle leaf into a silk-bound tent. Adults are famously tame, often landing on people as perches.

Large blue caterpillars trick Myrmica ants into carrying them home, then eat what?

They eat ant eggs and larvae: once a Myrmica worker carries it into the nest, the large blue caterpillar lives underground for most of a year feeding on the ant brood before pupating there.

The endangered Karner blue butterfly's life cycle depends entirely on which wildflower, its caterpillars' only food?

Wild blue lupine is the only thing its caterpillars eat; the world's largest population lives at Necedah National Wildlife Refuge in Wisconsin.

Which novelist first identified and described the Karner blue butterfly?

He slipped a description of a score of Karner blues, unnamed, into his novel Pnin.

Which institution holds Nabokov's 'genitalia cabinet' of male blue butterfly parts?

The Harvard Museum of Natural History's research arm, the Museum of Comparative Zoology, keeps the cabinet of blue-butterfly genitalia Nabokov dissected while curating Harvard's Lepidoptera in the 1940s; his wife Véra drove him to collecting sites.

Which extinct San Francisco butterfly was the first US species lost to urban development?

The Xerces blue lived only in the coastal dunes of San Francisco's Sunset District and was last seen in the early 1940s; the Xerces Society for invertebrate conservation takes its name from it.

Which toxins do Danaus plexippus caterpillars sequester from milkweed?

Cardenolides, the cardiac glycosides in milkweed sap, are stored in the monarch's body; the caterpillars tolerate doses that would poison other insects thanks to a resistant form of the sodium-potassium pump enzyme.

In Mexico, which animal can eat up to 40 overwintering monarchs in a single night?

The black-eared mouse (Peromyscus melanotis) eats up to 40 monarchs a night at the Mexican roosts; it tolerates the butterflies' cardenolides and feeds mainly on monarchs that have fallen to the forest floor.

In what year did Kenneth Brugger and Catalina Trail find the first monarch winter refuge?

In January 1975 Kenneth Brugger and Catalina Trail found the colony on Cerro Pelón in Michoacán, a mountaintop more than 4,000 km from where many of the butterflies had started.

Monarch Watch, the volunteer tagging programme, is based at which university?

Monarch Watch is based at the University of Kansas in Lawrence, where entomologist Chip Taylor founded it in 1992; its volunteers tag tens of thousands of monarchs each autumn.

Which magazine's August 1976 cover showed Catalina Trail blanketed in monarchs?

National Geographic ran Fred Urquhart's 'Discovered: The Monarch's Mexican Haven', announcing the overwintering sites to the world.

The Monarch Butterfly Biosphere Reserve lies about 100 km northwest of where?

Mexico City is the reference point; the reserve straddles Michoacán and the State of Mexico, with up to a billion butterflies arriving each winter.

Illegal logging of which fir trees threatens the monarchs' Mexican overwintering forests?

Oyamel fir (Abies religiosa) forests high in Michoacán shelter the roosts; illegal logging has thinned them, and the area occupied by monarchs fell to a record low of 0.67 hectares in the 2013–14 winter.

Danaus plexippus caterpillars moult through how many larval stages, or instars?

Each instar lasts three to five days; a full-grown fifth-instar caterpillar is about 4.5 cm long and weighs around 1.5 g.

What is the first thing a just-hatched Danaus plexippus caterpillar eats?

Its own egg case is the first meal: the hatchling eats the chorion, then chews milkweed in a circle to cut off the sticky latex, leaving a telltale arc-shaped hole in the leaf.

A Danaus plexippus adult emerges after roughly how long inside the pupa?

About two weeks: the monarch chrysalis takes roughly 10 to 14 days, and the new adult hangs upside down for hours pumping fluid into its wings before it can fly.

A monarch butterfly's wingspan is roughly how wide?

About 10 cm (8.9–10.2 cm): the wings are tawny orange with black veins, and the similar-looking viceroy is smaller with an extra black line across the hindwing.

Which British butterfly hibernates as an adult and hisses by rubbing its wings when disturbed?

The peacock (Aglais io) overwinters as an adult in sheds and hollow trees; if disturbed it flicks open its eyespotted wings and rubs them together to produce an audible hiss.

Which species is the 'butter-coloured fly' believed to have given butterflies their name?

Brimstone is an old word for sulphur, matching the male's yellow wings; it also lives up to a year, hibernating for seven months.

What is the mourning cloak butterfly called in Britain?

Two were found at Coldharbour Lane in Camberwell, south London, in August 1748; an older name was 'grand surprise'.

The mourning cloak, which lives almost a year, is the state butterfly of which US state?

Montana adopted the mourning cloak as its state butterfly in 2001; adults hibernate under loose bark and emerge before the snow has melted, feeding on sap rather than flowers.

Which butterfly was designated Florida's state butterfly in 1996?

The zebra longwing (Heliconius charithonia) became Florida's state butterfly in 1996; its black wings with pale yellow stripes warn predators that its body carries cyanide-based toxins.

Heliconius charithonia adults roost communally at night in groups of up to how many?

Up to 60 adults gather at dusk on a favourite twig and return to the same roost night after night, finding safety in numbers against predators.

Heliconius caterpillars feed on the vines of which plant?

Passion flower (Passiflora) vines are the only food of Heliconius caterpillars; they bite off or silk over the plant's hooked defensive hairs, and adults later lay eggs on the same vines.

Wallace caught his 'golden birdwing', which set his heart beating violently, in which archipelago?

Wallace netted Ornithoptera croesus, his golden birdwing, on Bacan in the Malay Archipelago in 1859; he wrote that the sight made his heart beat violently and left him close to fainting.

Linnaeus named the gulf fritillary 'vanillae' after a 1705 painting by which naturalist?

Maria Sibylla Merian painted the butterfly on a vanilla plant in her 1705 Metamorphosis Insectorum Surinamensium; Linnaeus took 'vanillae' from that plate, though the caterpillar feeds on passion flower, not vanilla.

Who drew the first known picture of a North American butterfly, in 1587?

John White, artist of Raleigh's Roanoke expeditions, painted an eastern tiger swallowtail in 1587 and labelled it 'Mamankanois', thought to be the Carolina Algonquian word for butterfly.

The viceroy, once thought a harmless monarch copycat, is now called what kind of mimic?

Müllerian: in 1991 Ritland and Brower found birds rejected wingless viceroy bodies as readily as monarchs, so the two unpalatable species share the cost of teaching predators rather than one copying the other.

The viceroy became the state butterfly of which state in 1990?

Kentucky made the viceroy its state butterfly in 1990; it can be told from the orange monarch by its smaller size and a black line crossing the hindwing veins.

Owl butterflies of the genus Caligo prefer to fly at what time of day?

Dusk: Caligo butterflies fly in the evening when insect-eating birds are scarce, which suits an insect that flutters only a few metres at a time; the genus name is Latin for 'darkness'.

Greta oto, the glasswing butterfly, can carry up to how many times its own weight?

Up to 40 times its own weight: the glasswing's transparent wings let it hide without bright colours, while its caterpillars feed on toxic Cestrum plants, which makes the adults unpalatable.

In Spanish-speaking regions the glasswing butterfly is called espejitos, meaning what?

Espejitos means 'little mirrors', for the way the clear wings catch the light; Greta oto ranges from Mexico through Central America into South America, with strays recorded as far north as Texas.

Kallima inachus is famous for closed wings that resemble what?

A dead leaf: the closed underside shows a midrib line, vein marks and mottled decay spots; open, the same wings flash a black tip, orange band and deep blue base.

Collectors once lured male purple emperors down from the oak canopy using what bait?

Rotting animal carcasses, typically a dead rabbit, were the classic lure; the species shuns flowers, feeding on aphid honeydew, oak sap, dung and roadkill, which gets many males killed by cars.

Papilio machaon is named after Machaon, a son of which Greek god?

Machaon was a son of Asclepius, the god of healing, and a physician in the Iliad; Linnaeus gave swallowtails Greek mythological names, and this one became the type species of Papilio.

Swallowtail caterpillars fend off attackers with a forked, smelly organ called what?

The osmeterium is a forked orange gland that stays hidden until the caterpillar is threatened, then inflates with fluid and pops out from behind the head, releasing a pungent smell.

Which butterfly's caterpillar resembles a bird dropping through every instar?

The giant swallowtail's caterpillar, the 'orange dog' of citrus groves, looks like a bird dropping in every instar; other caterpillars freeze to look like twigs or rear up to show snake-like eye markings.

Pipevine swallowtail caterpillars become poisonous by eating plants of which genus?

Aristolochia, the pipevines or Dutchman's pipes, supply aristolochic acids that make both larva and adult toxic; some tropical species are so potent they kill the larvae outright.

Which species is Australia's largest endemic butterfly?

The Cairns birdwing, with females up to around 15 cm across, is Australia's largest endemic butterfly; Priam's birdwing is bigger and also flies in Australia, but it ranges into New Guinea so is not endemic.

The electric-blue Ulysses butterfly is a tourism emblem of which Australian state?

Queensland used the Ulysses (Papilio ulysses) as a tourism emblem for its tropical north; males are so drawn to blue that they sometimes court blue objects mistaken for females.

Collector Albert Meek took the first Queen Alexandra's birdwing in 1906 using what?

A shotgun loaded with fine dust-shot: the giant flies high in the canopy, so Meek shot the first specimen; he soon found the early stages and bred most of the first specimens instead.

Which butterfly is the smallest in North America?

The western pygmy blue (Brephidium exilis), with a wingspan of just 12 to 20 mm, thrives in deserts and salt marshes and has hitchhiked with its host plants as far as the Persian Gulf.

The Atala butterfly's caterpillars feed on which native Florida cycad?

Coontie (Zamia integrifolia), Florida's only native cycad, is the Atala's natural host plant; ornamental cycads planted in suburban gardens have let the once-rare butterfly rebound.

Which species is the national butterfly of Denmark?

The small tortoiseshell (Aglais urticae) is Denmark's national butterfly; its foxy-red wings are ringed with blue spots, and eggs are laid in batches on common nettle.

The chequered skipper died out in England in the 1970s; where in Britain does it survive?

Western Scotland: it survives around Fort William in Lochaber on purple moor-grass; changes in woodland management wiped out the English colonies, and a reintroduction to Rockingham Forest began in 2018.

The comma butterfly's white comma-shaped mark sits where?

The white comma sits on the underside of the hindwing; wings folded, the ragged-edged butterfly passes for a dead leaf, and its caterpillar passes for a bird dropping.

The small cabbage white reached North America around 1860 via which Canadian province?

Quebec City, around 1860, was the first North American foothold of Pieris rapae; it went on to colonise Hawaii in 1897, New Zealand in 1930 and Australia in 1937, all by accident.

Skippers are named for their darting flight; how are the tips of their antennae shaped?

Hooked backward like a crochet hook, where typical butterflies have club tips; more than 3,500 skipper species are known, most in Central and South America.

The famously well-preserved fossil butterfly Prodryas persephone comes from which fossil beds?

Florissant Fossil Beds in Colorado yielded the specimen in 1878; about 34 million years old, from the Late Eocene, its wing pattern survives in fine volcanic ash.

The oldest butterfly fossils date to the Paleocene, about how many million years ago?

About 56 million years: the oldest known butterfly fossil is a skipper, Protocoeliades kristenseni, from Denmark's Fur Formation; molecular clocks suggest the group actually arose earlier, in the Cretaceous.

Roughly how many butterfly species are there worldwide?

Around 20,000 (estimates run from 17,500 to 20,000), split into just seven families, with the Neotropics holding the lion's share of species.

Butterflies live on every continent except which one?

Antarctica has none; the Neotropics alone hold about 7,700 species, ten times the tally of North America.

How does a basking butterfly avoid overheating in strong sun?

A butterfly turns its wings edge-on to the sun so they catch less radiation; when cool it does the opposite, basking with wings spread, and some species shiver their flight muscles to warm up.

The tiny funnel-shaped openings that let sperm into a butterfly egg are called what?

Micropyles are tiny channels at the top of the egg through which sperm enter as it is laid; the hard ridged shell, the chorion, is lined with wax to stop it drying out.

The spiny pad at the tail of a butterfly pupa that hooks it to a silk button is the what?

The cremaster is a spiny hook at the pupa's tail that grips a silk button; most pupae hang head-down from it, while swallowtails and whites add a silk girdle to stay head-up.

The term for a butterfly's pupal case derives from the Ancient Greek word for which metal?

Gold: 'chrysalis' comes from the Greek chrysos, 'gold', because many pupae, such as the monarch's, carry metallic gold spots or a golden sheen.

A freshly emerged butterfly inflates its crumpled wings by pumping in what?

Hemolymph, the insect's blood, is pumped through the wing veins to expand the crumpled wings; until they dry and stiffen the insect is helpless and at its most vulnerable to predators.

'Hilltopping', where males patrol ridge tops and summits, is a strategy for what?

Finding mates: hilltopping males wait at summits where receptive females of sparse populations fly up to meet them; a landmark makes a reliable rendezvous for insects that would otherwise rarely meet.

Butterflies that land on people to sip sweat are after which mineral?

Sodium: nectar is short of it, and sweat, tears and mud puddles supply the salt butterflies need for nerve and muscle function; males may pass sodium to females as a nuptial gift during mating.

Migrating butterflies steer with a time-compensated compass based on what?

The sun: monarchs use a time-compensated sun compass, with a clock in the antennae correcting for the sun's movement across the sky; they also see polarised light, which keeps them on course under cloud.

By what percentage did US butterfly populations decline between 2000 and 2020?

22%: a 2025 study in Science drawing on 35 monitoring programmes found US butterfly abundance fell 22% between 2000 and 2020; habitat loss, pesticides and climate change, especially warmer autumns in the West, drove it.

The oldest known butterfly illustration, a 3,500-year-old plain tiger fresco, is where?

Luxor: a Theban tomb fresco of about 1500 BC shows plain tigers in a marsh hunting scene; Egyptian artists used butterflies to suggest life and freedom, balancing the death in the picture.

The ancient Greek word for butterfly, psyche, primarily means what?

A Roman sculpture shows a butterfly leaving a dead man's mouth, the soul departing the body.

A person who studies butterflies and moths was archaically called what?

An aurelian, from 'aurelia', an old word for a chrysalis; London's Society of Aurelians of the 1740s was among the earliest entomological societies. The modern term, lepidopterist, comes from the Greek for 'scale' and 'wing'.

Who became President of the UK charity Butterfly Conservation in 1998?

Sir David Attenborough became President of Butterfly Conservation in 1998; the charity began in 1968 as the British Butterfly Conservation Society and grew to tens of thousands of members.

Buddleja davidii, the 'butterfly bush' of countless gardens, originally comes from where?

China is its home; Oregon lists it as a noxious weed, and it feeds adult butterflies but almost no caterpillars.

Danaus chrysippus, the plain tiger, is also known as the African what?

The African queen, also called the African monarch: its milkweed diet makes it emetic to predators, so other butterflies, such as female Hypolimnas misippus, copy its orange-and-black pattern.