Monarch Butterfly Life Cycle: Egg to Adult (Danaus plexippus) with Photos

From milkweed egg to striped caterpillar, jade chrysalis, and fluttering monarch, witness metamorphosis, migration, and our role in protecting Danaus plexippus across North America today.

On the underside of a milkweed leaf, the world begins small enough to miss unless you kneel and look closely. In this first photograph the newborn is still a whisper of life, a pale pinhead egg collapsed into a glistening scrap, the tiny caterpillar beside it like a gray comma punctuating the green. It has just eaten the soft shell that cradled it—its first meal, its first thrift. The leaf’s pale roads of veins radiate around the hatchling; within that simple map lies all the geography it needs.

By the second photograph appetite has taken its proper throne. These pilgrims wear a uniform of warning: bands of yellow, black, and white—stripes as bright as hazard tape, a heraldic banner advertising the bitterness borrowed from milkweed. Each bite draws down defensive latex; yet the caterpillars feed undeterred, pausing to snip the leaf’s veins to quiet the flow. Their black, threadlike “tentacles” nod as they travel, and their peppery pellets—frass—collect like midnight hail. Five times they will outgrow themselves, shrugging off skins to reveal wider, hungrier versions within. The room is strewn with green rib and ragged edges; the air has the gentle smell of cut stems. All the while, milkweed’s poisons, the cardenolides, pass into growing bodies and become their bodyguard.

At last a hush. A final meal, a purposeful wander. The caterpillar chooses a high eave of the world—a stem, a stick, the corner of your rearing tent—and hooks itself into a downward J. Within hours the skin splits like a soft zipper; the striped creature pours itself out of itself and seals into a smooth chrysalis.

Here, the caterpillar has attached itself to a silk pad from which it hangs. Underneath the skin, the caterpillar is transforming to the chrysalis. In these photographs the silk pad and chrysalis attachment from a previous transformation are in the foreground.
Macro of the Monarch butterfly chrysalis. The black stalk attached to the silk pad is call a cremaster.

The following photograph and video catch the moments into becoming: the jade lantern has become transparent, darkening, its gold studs glinting like constellation points, and through the thinning walls the folded wings show, orange smoldering under smoke. Inside, old tissues have dissolved into a living broth; imaginal discs—tiny blueprints carried since the egg—have flowered into legs, eyes, and flight. To call it “metamorphosis” is correct; to call it mystery is truer.

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When the case opens the butterfly backs into the bright. It clings while the crumpled wings fill and flatten, hemolymph pumping life into every cell. In the next image the adult drinks from a petunia trumpet, a jeweled ember with white-spotted hems. The monarch—Danaus plexippus—tests the wind with new, purposeful wings. Its scientific name nods to ancient stories: Danaus after the Greek mythic king of Argos, a father who fled with his fifty daughters across the sea; plexippus for Plexippus, a figure of the same old tales—his name carried forward into this wanderer of the sky. The English name “monarch” is said to honor both its regal size and domain, and, some say, the orange-and-black of William of Orange. Kings and myths gathered like cloak and scepter around a creature that weighs less than a paperclip.

No butterfly has entered human life more completely. Schoolchildren cradle jars of milkweed sprigs and tape handwritten labels to chrysalides lined like seed pearls along a classroom window. Taggers kneel in September light, add a tiny disc to a wing, and write down time and place so the journey south can be traced. In the mountains of Mexico, where oyamel firs hold winter like a secret, people fold the monarch’s return into the Days of the Dead, believing that souls ride home on those wafers of flame. Gardeners tuck swamp milkweed into narrow beds and call their yards “waystations.” Photographers, such as myself, record the stories that happen leaf by leaf.

In early July a Monarch caterpillar revels in milkweed flowers.

Yet our touch is not simple. Fields simplified by herbicides have shaved milkweed from fencerows; tidy mowing removes nectar from roadsides in the tender weeks of migration; captive rearing in vast numbers, though done with reverence, may carry unintended risks of disease and weakened orientation. The monarch asks us to enlarge our sense of home beyond the fence: to let patches of milkweed lift their pale crowns in rough corners; to choose late-blooming asters and goldenrod; to keep a few ditches shaggy until the travelers pass. Conservation, like metamorphosis, is work that happens inside ordinary days.

Watch the cycle again in my images—egg to appetite, appetite to stillness, stillness to wing—and hear what it whispers in the steady voice of milkweed leaves and soft fall air. Rachel Carson wrote that “those who contemplate the beauty of the earth find reserves of strength that will endure as long as life lasts.” Here beauty wears stripes and beads of gold, sips from garden petals, and threads a continent with its frail insistence. The monarch’s life is a ribbon we can follow with our eyes and, if we are willing, with our hands—gentle hands that leave room for milkweed to rise, for caterpillars to feed, for a chrysalis to darken and a window to fill, one bright morning, with wings.

On a personal note, this season was a success. Monarchs visited our milkweed patch several times allowing me to save/harvest nineteen eggs/caterpillars and raise them until release.

Selected references
Carson, Rachel. The Sense of Wonder. New York: Harper & Row, 1965. (Reissued: HarperCollins, 1998; Open Road Media e-book, 2011.) The quoted passage (“Those who contemplate the beauty of the earth…”) appears early in the book; the Open Road edition places it on p. 41.
Wikipedia contributors. “Monarch butterfly — Etymology and taxonomy.” (useful overview with primary citations).
Oberhauser, K. S., and M. J. Solensky, eds. The Monarch Butterfly: Biology and Conservation. Cornell University Press, 2004.

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Explore Louisa Duemling Meadows: Nature and Conservation

The Louisa Duemling Meadows celebrate conservation and biodiversity, showcasing vibrant flora and honoring Louisa Duemling’s legacy as a steward of nature.

The Louisa Duemling Meadows, nestled within the expansive embrace of Sapsucker Woods, offers a vibrant tableau of life, brimming with opportunities for exploration and a sense of wonder. This new trail, winding through golden fields and punctuated by bursts of wildflowers, whispers tales of the land’s natural and cultural heritage.

Louisa Duemling: A Steward of Nature
Louisa Duemling, the meadows’ namesake, was a dedicated conservationist and philanthropist who supported the Cornell Lab of Ornithology’s mission to protect birds and their habitats. Her legacy lives on in these serene fields, where her commitment to preserving the environment is reflected in every thriving plant and songbird.

Black-eyed Susans: The Meadow’s Golden Treasure
Dominating this summertime landscape with their radiant yellow petals and dark central disks, Black-eyed Susans (Rudbeckia hirta) are a hallmark of the meadows. These cheerful blooms are a delight to the eye, a cornerstone of meadow ecosystems. As members of the Asteraceae family, their composite flowers serve as a rich nectar source for pollinators like bees and butterflies, ensuring the vibrancy of these fields.

Historically, Black-eyed Susans have been used in traditional medicine by Native American tribes for their putative anti-inflammatory properties. Their ability to thrive in diverse conditions also makes them a symbol of resilience and adaptability.

A Symphony of Green and Gold
Walking through the trail, one is greeted by the harmonious interplay of goldenrods (Solidago spp.), milkweeds (Asclepias spp.), and asters (Symphyotrichum spp.). Goldenrods, with their feathery clusters of yellow blooms, are often mistaken as allergenic culprits, though it is the inconspicuous ragweed (Ambrosia artemisiifolia) that deserves this reputation. Milkweeds, with their milky sap and delicate pink or white flowers, are vital to monarch butterflies (Danaus plexippus), serving as the sole food source for their larvae.

Among these botanical wonders, the birdhouse stands as a sentinel, a reminder of the intricate relationship between flora and fauna. These wooden structures provide safe havens for cavity-nesting birds like Eastern Bluebirds (Sialia sialis) and Tree Swallows (Tachycineta bicolor), fostering biodiversity within the meadow.

A Horizon Framed by Pines and Clouds
The open meadow trails, flanked by clusters of Eastern White Pines (Pinus strobus) and punctuated by the azure sky, invite reflection and renewal. This is a place where the human spirit can align with the rhythms of nature, where each step reveals new layers of beauty and discovery.

Embracing the Spirit of Discovery
To wander the Louisa Duemling Meadows is to immerse oneself in the timeless dance of life. The trail, carefully marked yet wild in essence, invites visitors to lose themselves in its beauty while finding solace in its quietude. This is not just a path through nature—it is a journey into the heart of conservation and a celebration of the life that thrives under Louisa Duemling’s enduring legacy.

As you leave the meadow, carry with you not just the memory of golden flowers and vibrant skies but the inspiration to cherish and protect the natural world. The Louisa Duemling Meadows are not only a gift to those who walk its trails but a reminder of the profound impact one can have in preserving our planet’s fragile beauty.

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Monarch Chrysalis: A Symbol of Nature’s Resilience

On a September day, a Monarch chrysalis symbolizes resilience amidst environmental threats, prompting reflection on stewardship and hopeful change.

On a warm September afternoon, 2024, Pam and I passed a planting of shimmering grasses along the Cayuga Lake shore, the tips of their feathery plumes swaying in a gentle breeze. Amidst the verdant tapestry, my eyes caught a flash of delicate green—a Monarch chrysalis, hanging like a precious jewel beneath one of the seed heads. It was an unexpected encounter, a moment of grace that felt almost otherworldly. The chrysalis, pale jade with gold accents, looked like something born of magic rather than biology. For a moment, time paused.

The only Monarch chrysalis we found in 2024, notable for the absence of caterpillars around our home. Tompkins Park, Ithaca, New York, Finger Lakes Region

I knelt carefully, mindful not to disturb the fragile life suspended before me. As I leaned in closer, I marveled at the perfection of its design. The intricate gold dots along its casing seemed impossibly precise, as though a divine hand had painted them there. Yet, this chrysalis was also a paradox: it was a shield of stillness, promising the coming transformation of a creature known for motion and migration.

The significance of this discovery didn’t escape me. Just two years ago, the International Union for Conservation of Nature officially classified the Monarch butterfly as “endangered.” Habitat destruction, pesticide use, and climate change have decimated their numbers. Monarchs, once so plentiful they seemed a seasonal certainty, now teeter on the edge of disappearance. To find this chrysalis was to witness a quiet rebellion against those odds, a solitary emblem of resilience in a world fraught with loss.

I thought of their epic journey—a migration that spans thousands of miles, linking Canada to the forests of central Mexico. For generations, these butterflies have followed ancestral paths with unerring precision, defying every obstacle in their way. How can something so small carry the weight of such immense journeys? And how, in a world that seems to grow harsher each year, do they still persist?

This chrysalis, tucked in the grasses of Stewart Park, felt like an answer to those questions. It was a reminder of the resilience of life, the determination of nature to continue despite all that works against it. And yet, it also felt like a fragile promise. The Monarch’s survival is no longer assured; its future, like the butterfly within this chrysalis, hangs by a thread.

As I rose and continued our walk, I carried the image of the chrysalis with me, letting its quiet beauty settle in my mind. I thought of the interconnectedness of all things: the milkweed plants that sustain Monarch caterpillars, the winds that guide their migrations, and the people whose choices shape the landscapes they traverse. Stewardship is not just a responsibility; it is a privilege—an opportunity to ensure that these miraculous creatures continue to grace our skies.

By the time I left the park, the sun had sunk toward the west, its light no longer graced the grasses. I looked back one last time, hoping that this chrysalis would complete its transformation safely. In its stillness, I saw not just hope, but a call to action. The Monarch’s story is not just about survival; it’s about the courage to evolve and adapt, even when the odds seem insurmountable. And perhaps, in witnessing this moment of metamorphosis, we too are reminded of our capacity to change—to become better stewards of the world we share.

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The Autumn Tapestry of Cayuga Lake: A Journey on the Treman Park Lake Loop

Autumn’s Arrival Along Cayuga Lake

In Autumn 2024, the Treman Park Lake Loop of the Cayuga Waterfront Trail in Ithaca, New York, unfurled a vibrant display of seasonal transition. The natural landscape, adorned with fiery hues of reds, oranges, and yellows, reflected in the rippling waters of Cayuga Lake, creating a harmony of color and light. This is a scenic journey through stories of plant and animal life that call this place home—including the majestic Osprey (Pandion haliaetus) that nests along the shore.

The Osprey’s Watchtower

A sight to greet visitors is the solitary osprey nest perched high on a pole. Used by Osprey families during their breeding season, this nest stands as a testament to their remarkable recovery in the Finger Lakes region. Ospreys, once declining due to pesticide use, have rebounded significantly following conservation efforts.

With a wingspan of up to 6 feet, these raptors are expert fish hunters, often seen diving talons-first into the lake to snatch their prey. During autumn, as their young take flight, the nest remains an empty marker of the summer’s success—a reminder of the cyclical nature of life along the lake.

Did You Know? Ospreys are often referred to as “fish hawks” because fish make up 99% of their diet.

The Meadow and Its Golden Touch: Reedbeds and Goldenrod

Surrounding the osprey pole, expansive meadows of grasses and reeds sway with the breeze. Among these are stands of Common Reed (Phragmites australis), a tall grass with feathery plumes that catch the sunlight. While Phragmites can sometimes be invasive, they provide crucial shelter and food for various species of birds and insects.

Intermixed with the reeds are patches of Goldenrod (Solidago spp.), whose bright yellow flowers are a signature of late summer and autumn in the Northeast. Goldenrods are critical for pollinators, offering nectar to bees, butterflies, and migrating insects like the Monarch butterfly (Danaus plexippus).

Ecological Note: Goldenrods are often mistakenly blamed for allergies; the real culprit is ragweed (Ambrosia artemisiifolia), which blooms at the same time but releases airborne pollen.

A Lake Alive with History and Beauty

The shimmering blue waters of Cayuga Lake form the centerpiece of this trail. The lake, stretching nearly 40 miles, is the longest of the Finger Lakes and steeped in geological and cultural history. Its name is derived from the Cayuga Nation, part of the Haudenosaunee Confederacy, who inhabited the region for centuries.

The striking red lighthouse in the water serves as a vivid counterpoint to the natural surroundings. Built to aid navigation, it now stands as a picturesque focal point for photographers and nature enthusiasts alike.

Cayuga Inlet Light Beacon

In the distance, a sailboat glides across the lake—a serene reminder of the recreational draw that Cayuga Lake holds year-round.

West shore with sailboat and lake houses

The Forest Fringe: A Kaleidoscope of Color

The forests that fringe the meadow and the lake present an explosion of autumn color. Trees such as Sugar Maple (Acer saccharum), Red Oak (Quercus rubra), and Black Cherry (Prunus serotina) dominate the canopy, their leaves transforming into brilliant oranges, scarlets, and deep burgundies. The Sugar Maple, in particular, is renowned for its vibrant golden-orange foliage, a hallmark of the northeastern fall.

The Ithaca Yacht Club lies south of Maplewood Point

Closer to the ground, the understory hums with the activity of migrating birds and foraging mammals. Squirrels can be seen gathering acorns, preparing for the winter months ahead, while chickadees flit among the branches, calling their cheerful “fee-bee” notes.

Historical Fact: The Finger Lakes were carved out by retreating glaciers over 10,000 years ago, leaving behind these deep, elongated lakes and fertile soil that supports rich biodiversity.

A Path Through Time and Nature

Walking the Treman Park Lake Loop is a sensory journey—the crispness of the autumn air, the rustling of reeds, and the rhythmic lapping of waves against the shore combine to evoke a timeless tranquility.

From the vibrant meadows to the osprey’s lofty perch and the quiet expanse of Cayuga Lake, this section of the Waterfront Trail encapsulates the beauty and diversity of the Finger Lakes ecosystem. Whether for quiet reflection or active exploration, it remains a treasured destination in every season.

Closing Thoughts

As autumn deepens, this landscape prepares for the dormancy of winter. Yet the stories it holds—from the osprey’s nest to the goldenrod’s bloom—remain alive, waiting to be rediscovered with each new season. The Treman Park Lake Loop is not just a trail; it is a canvas of life, change, and history painted by nature’s hand.

Reflection: To walk this trail is to connect with a land shaped by glaciers, nurtured by waters, and home to countless species that continue to thrive amid the ever-turning wheel of the seasons.

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Farewell to the Monarchs for 2023

Monarch from caterpillar to chrysalis to butterfly

Here are two of the ten monarchs we release this year. In under three minutes this video shows a monarch caterpillar transforming into a chrysalis, emerging two weeks later as a butterfly. Music “Emotional Underscores Vol. 3” by Yuri Sazonoff (SOCAN) “Can You Guess” and “Blessing”

Migrating monarchs soar at heights of up to 1,200 feet. As sunlight hits those wings, it heats them up, but unevenly. Black areas get hotter, while white areas stay cooler. The scientists believe that when these forces are alternated, as they are with a monarch’s white spots set against black bands on the wings’ edges, it seems to create micro-vortices of air that reduce drag—making flight more efficient.

Monarchs begin leaving the northern US and Canada in mid-August. They usually fly for 4-6 hours during the day, coming down from the skies to feed in the afternoon and then find roosting sites for the night.  Monarchs cannot fly unless their flight muscles reach 55ºF. On a sunny day, these muscles in their thorax can warm to above air temperature when they bask (the black scales on their bodies help absorb heat), so they can actually fly if it is 50ºF and sunny. But on a cloudy day, they generally don’t fly if it is below 60ºF.

“Migrating monarchs use a combination of powered flight and gliding flight, maximizing gliding flight to conserve energy and reduce wear and tear on flight muscles.  Monarchs can glide forward 3-4 feet for every foot they drop in altitude.  If they have favorable tail or quartering winds, monarchs can flap their wings once every 20-30 feet and maintain altitude. Monarchs are so light that they can easily be lifted by the rising air. But they are not weightless. In order to stay in the air, they must move forward while also staying within the thermal. They do this by moving in a circle. The rising air in the thermal carries them upward, and their overall movement ends up being an upward spiral. Monarchs spiral upwards in the thermal until they reach the limit/top of the thermal (where the rising air has cooled to the same temperature as the air around it). At that point, the monarch glides forward in a S/SW direction with the aid of the wind. It glides until it finds another thermal and rides that column of rising air upwards again.”

Reference: text in italics and quotes is from one of two online articles. “The monarch butterfly’s spots may be its superpower” National Geographic, June 2023 and “Fall Migration – How do they do it?” by Candy Sarikonda, September 2014.

Copyright 2023 Michael Stephen Wills All Rights Reserved

First Release of 2023

Advice for releasing your monarch butterfly

We let our first monarch butterfly rest overnight, until noon of the following day.

Pam did better with tracking the monarch’s flight, so I used video. Thanks Pam!

I delay butterfly release when:

  • the forecasted high temp is below 65° F (18° C) or 60° F (16° C) if sunny and calm.  When no other option exists, 50-59° F and sunny is borderline acceptable.
  • the forecast calls for rain.  A light rain is not a problem for butterflies with day-old dry wings, but it’s not a good release option for first-day newborns.
  • the butterfly emerges too late in the day.  I keep it overnight if the butterfly cannot get 3 hours warming of flight muscles in the sun.
  • there are storms in the forecast.  I wait when there are less than four (4) hours of good weather projected.  When extreme weather (like a hurricane) is forecast within twenty four (24) hours, I keep the butterfly safe until the storm passes.  Twenty four (24) or more hours should provide ample time to find shelter from the storm.
  • I am not sure about a release.  Keeping a butterfly overnight is acceptable. In fact, a butterfly’s wings are stronger on day two (2), providing better capability to escape predators.  A butterfly can easily hang from the mesh cage roof overnight. I do not worry about feeding a butterfly unless a second night of shelter is necessary.

As the moment of emergence approaches, the skin of a Monarch chrysalis becomes translucent to reveal the butterfly compressed into that small space.
Copyright 2023 Michael Stephen Wills All Rights Reserved

First Emergence of 2023

Monarch butterfly and chrysalis

Our grandchildren spent the day with us, the last week of their summer before school begins. This July I had improved on my Monarch collection from 2022, when 9 butterflies were released, by two (2) caterpillars for a total of eleven (11) raised over several weeks to the chrysalis stage. When leaving to pick up the children for an outing one chrysalis skin had turned clear, a sign the enclosed butterfly is close to emerging. We returned from an outing for lunch to find this chrysalis unopened, so we checked now and then for progress. Four hours later, just as their Mom arrived for them, the grandchildren and everyone witnessed this event. What luck!!

Migrating monarchs soar at heights of up to 1,200 feet. As sunlight hits those wings, it heats them up, but unevenly. Black areas get hotter, while white areas stay cooler. The scientists believe that when these forces are alternated, as they are with a monarch’s white spots set against black bands on the wings’ edges, it seems to create micro-vortices of air that reduce drag—making flight more efficient.

Monarchs begin leaving the northern US and Canada in mid-August. They usually fly for 4-6 hours during the day, coming down from the skies to feed in the afternoon and then find roosting sites for the night.  Monarchs cannot fly unless their flight muscles reach 55ºF. On a sunny day, these muscles in their thorax can warm to above air temperature when they bask (the black scales on their bodies help absorb heat), so they can actually fly if it is 50ºF and sunny. But on a cloudy day, they generally don’t fly if it is below 60ºF.

“Migrating monarchs use a combination of powered flight and gliding flight, maximizing gliding flight to conserve energy and reduce wear and tear on flight muscles.  Monarchs can glide forward 3-4 feet for every foot they drop in altitude.  If they have favorable tail or quartering winds, monarchs can flap their wings once every 20-30 feet and maintain altitude. Monarchs are so light that they can easily be lifted by the rising air. But they are not weightless. In order to stay in the air, they must move forward while also staying within the thermal. They do this by moving in a circle. The rising air in the thermal carries them upward, and their overall movement ends up being an upward spiral. Monarchs spiral upwards in the thermal until they reach the limit/top of the thermal (where the rising air has cooled to the same temperature as the air around it). At that point, the monarch glides forward in a S/SW direction with the aid of the wind. It glides until it finds another thermal and rides that column of rising air upwards again.”

This video includes an interview with Michael Wills about raising Monarch butterflies and this stage of the lifecycle. Video by Pam Wills using an IPhone 8

Reference: text in italics and quotes is from one of two online articles. “The monarch butterfly’s spots may be its superpower” National Geographic, June 2023 and “Fall Migration – How do they do it?” by Candy Sarikonda, September 2014.

Copyright 2023 Michael Stephen Wills All Rights Reserved

Goodbye for 2022

Our last Monarch for 2022

We successfully raised nine (9) Monarch butterflies this season, leaving us feeling, “Let’s do more in 2023.” Today’s post cover is a portrait of the last. She flew yesterday, September 23rd, forty (40) feet up to the oak tree shading the back yard, lost to us in the leaves.

Her chrysalis is the second from right in the following family photograph.

Here are two videos of our last 2022 Monarch to emerge and the first.

Emergence of a Monarch butterfly from a chrysalis 4K UHD with relaxing music. A caterpillar attached itself with silk to hang by its two rear legs to transform to a green chrysalis. Fourteen days later the chrysalis shell becomes translucent. Inside the chrysalis the Monarch butterfly moves to shed the shell. The released insect’s abdomen pumps fluid, expanding the crumpled wings. The entire process takes twenty minutes, compressed in this video to about six (6) minutes.

A real time film of our first 2022 Monarch Butterfly emerging from the chrysalis, then expanding its wings in 4K UHD with relaxing music. The process takes twenty (20) minutes.

The butterfly emerges from the chrysalis about fourteen (14) days after setting. To the photographer needing to capture the moment a signal is the green, jewel-like chrysalis turns transparent, apparently darkening to reveal the compressed form of the butterfly. It can be hours before the insect breaks free, the Canon EOS 5D Mark IV dslr camera is used for this. I set it on a Manfrotto BeFree Carbon Fiber tripod (with ball head), a Canon EF 100mm f/2.8L macro lens for optics. The Mark IV has WIFI and HD video capabilities, so I connected the camera to an Apple IPhone 7 using Canon software. Monitoring the transparent chrysalis in real time, I continually reset the video from the IPhone until the butterfly emerged. I used AVS video editor software to produce the film for YouTube publication.

Copyright 2022 Michael Stephen Wills All Rights Reserved

Monarch Ready to Fly

Five wait off stage for their turn to fly.

This Monarch butterfly emerged from the chrysalis a few moments ago. A minimum of two hours is required for the wings to harden before release to the wild.

Five wait off stage for their turn to fly.

Rainy weather forced us to leave her resting a full 24 hours.

Here are two videos of a Monarch release from 2020.

Copyright 2022 Michael Stephen Wills All Rights Reserved

Monarch Caterpillar to Chrysalis II

AKA the sixth moult

In my last series of “Monarch caterpillar transforming to chrysalis” time lapse photographs, the 30-minute time interval missed the moult. For this series, I set the Canon EOS 5D Mark IV to remote from a IPhone 7, tethering me to hanging around the house for an afternoon of waiting for the magic moment of “transformation” (more accurately called “the moult”), thinking through the nature of the moment.

A monarch caterpillar accomplishes seven body transformations shielded from view. Six within its skin: the first five retaining a caterpillar body configuration, the sixth transforming to chrysalis. For all six, an enveloping skin conceals the change. The same holds true for the seventh transformation. The chrysalis remains opaque green with bright gold spots until turning transparent after the transfiguration to butterfly is complete.

The sixth transformation happens when the fifth instar caterpillar, fully sated with milkweed, climbs to a perch, spins silk around a set of prolegs, affixing them from a horizontal surface from which to hang. For this set I captured the moult of two monarchs hanging side by side inside a mesh cage with an east facing window for light. Even though the day was sunny, with the f-stop set to the lens maximum (32) for the deepest field of view, ISO at 32,000 the energetic skin shedding movements of the chrysalis cause blurring.

For 10-12 hours of profound bodily configuration changes the hanging caterpillar hangs without movement. In the last image of this first set, the next caterpillar is blurred by initial moult movement.

My attempt to capture a video of the moult was frustrated by inadequate lighting, the result was too dark to use. I must solve this technical challenge as the motions of the chrysalis as difficult to believe without visual proof. That said, here is the second moult with the first completed moult in background.

An interesting fact is the caterpillar uses silk to attach the skin to a substrate for the first five moults to hold the skin back while it crawls out of the discarded skin. The first meal of the hatched caterpillar (first instar) is the egg, the shed skin is the first meal for instars 2 – 4. The shed skin of instar 5 drops from the chrysalis. This is why you should never remove a Monarch caterpillar from the leaf, as in doing so may hinder a moult in progress.

Copyright 2022 Michael Stephen Wills All Rights Reserved