Twenty-six Australian butterflies could be gone within twenty years. Six of them are protected by law. The other twenty are on their own.

Nine in ten Australians live on ground that has already been cleared. For a native butterfly, that leaves one kind of habitat left in the postcode — the fenced, mown, four-hundred-square-metre backyard. Not a national park. Not a reserve. A backyard.

Orchard Swallowtail. Wanderer. Australian Painted Lady. Common Brown. Species that were simply there every summer — crossing the back lawn after lunch, settling on the buddleia, drifting past the flyscreen as though they always had and always would. The Bogong moth now sits on the IUCN Red List as endangered. Dozens of other species are heading the same way.

The summer of 2024–25 was, for a lot of backyard naturalists, the first in which the quiet was impossible to miss. Nothing over the grevilleas in the afternoon. Nothing on the flyscreen at dusk. Just stillness where thirty years ago there was traffic.

These are not impressions. These are counts.

Why the backyard became the last line of defence

That figure is not a campaign number. It comes from a 2021 assessment published in Austral Entomology, compiled by 28 entomologists, which ranked the Australian butterflies at the highest risk of being lost and put a timeline on several of them. Twenty of the twenty-six carry no legal protection at all. The pressures behind that ranking — land clearing, habitat fragmentation, pesticide use, the disappearance of native plantings — are the same pressures reshaping every suburb in the country.

Butterflies are not decorative. Where they go, the birds that raise their chicks on caterpillars go with them. The native plants that rely on them for pollination stop setting seed. The decline is not an aesthetic loss — it is a collapse signal. And it has been flashing for years.

Around 86% of the population is packed onto less than a quarter of one per cent of the continent. Inside that strip there is no remnant scrub, no understorey, no fallen timber left where it lands. What is left is backyards, courtyards and balconies.

A Wanderer that finds nowhere sheltered to see out the cold months does not make it through to spring. An Orchard Swallowtail that finds no viable habitat in September does not come back. That is the mechanism behind every one of those numbers.

A properly built butterfly house is the only realistic intervention still available in an average Australian backyard — the only place a native butterfly can find the narrow, dark shelter that keeps predators out, holds temperature steady and manages moisture.

But only if the house is actually right.

Thirty-one winters in a Blackall Range shed — and what they taught her about butterflies

The shed behind the Carmody place on the edge of Maleny measures barely thirty square metres. Hand tools cover every wall, handles gone dark with use. On the bench, a row of teardrop-shaped timber houses — some still raw, some finished, narrow slots cut into the front and a small sand-filled basin at the base.

Dulcie Carmody is 74. Maleny, Queensland — up on the Blackall Range, an hour inland from the Sunshine Coast, the sort of town where people still know their neighbours. Everyone up on the Range just calls her Dulcie.

Her late husband Ron was a cabinetmaker. He taught her the teardrop form — aerodynamic, quiet in the wind, no strain on the hanging hardware. Dulcie has never built another shape. In thirty-one years she has built more than 2,600 houses. Every one with the same slot calibration. Every one with the basin at the base.

She runs her thumb along a freshly sanded edge without looking up. “I haven’t counted a Richmond Birdwing on this ridge since 2009,” she says. She has been counting since 1996. Through the late nineties, eight or ten species in a single summer. Last season: two. “That does something to you,” she says. “You watch it go, year after year. And you can’t stop it.”

What she can do, she knows. And what does not help, she knows just as well.

“People buy a house, hang it up — and nothing ever comes. Not one visitor. It is nearly always the house.” The slot width, for a start: too wide and a common myna or a starling takes it over before a butterfly gets a look in; too narrow and nothing goes in at all. Or the missing puddler — butterflies draw minerals out of damp sand, and that is not a comfort feature, that is biology. Then there is the painted timber, reeking of chemicals. “I see those bright lacquered ones at the garden centre,” Dulcie says, setting her work back on the bench. “Lovely to look at. They stay empty.”

Why Dulcie’s houses get used when everything else sits empty

Not principles, not philosophy — specific measurements, materials and mechanisms. The difference between a house that gets visited and one that stays empty, distilled from thirty-one years of trial and observation. Every feature is the direct result of something Dulcie learned the hard way.

• “The Teardrop Architecture” — Ron’s signature shape, and an engineering decision. The teardrop profile spreads wind load evenly; the house does not spin, does not rock, puts no strain on the mount. Dulcie’s oldest house has hung from the same silky oak since 1999. Same hardware, never retightened. Same visitors every spring.
• “The 18-Millimetre Rule” — Entry slots cut to a shade under twenty millimetres: wide enough for Orchard Swallowtails and Australian Painted Ladies, narrow enough to shut out common mynas and starlings. “A millimetre out,” Dulcie says, “and the house stays empty — or it turns into a trap.”
• “The Puddler Principle” — A sand-filled basin at the base. Butterflies take minerals from damp, sandy ground — entomologists call it puddling, and for a lot of species it is not optional, it is survival. Missing from virtually every butterfly house sold in this country.
• “The Raw Timber Protocol” — Untreated natural timber. No stain, no sealer, no finish. Chemical odours read as danger to a butterfly. A painted house gets avoided even when every other measurement is right.
• “The Season Panel” — The back panel opens without tools: brush it out once a season, top up the puddler, done. Most butterfly houses cannot be cleaned at all — after one season it is mould, larval debris and parasites. The season panel turns a one-off purchase into a decade-long habitat.

Sixty-eight houses. Then she shuts the shed.

Dulcie’s daughter Janelle lives in Geelong. Since Ron died three years ago the trip has felt a great deal further than it looks on a map — a flight, then a drive, then the whole thing again in reverse. The grandkids are growing up fast. A great-grandchild arrived in February. Dulcie has not been there enough. She knows it.

The decision to leave Maleny was slow. Then, all at once, it was not.

What she is leaving cannot be packed. The smell of raw sanded timber on a cold Range morning with fog still sitting in the gully. The particular quiet of the shed before breakfast, light coming in the eastern window. The rhythm of the work — measure, cut, sand, fit — that Ron taught her and that is now as ordinary as breathing. She never thought of those mornings as precious. Not until she started counting the ones she had left.

Sixty-eight houses are left on the bench. None will be made again. Nobody else knows the exact slot calibration. Nobody else has the jigs Ron built in 1993. When the last carton goes out, the shed is finished. Not retired. Finished.

Whoever takes one now takes the last thing to come out of that shed. That is not a sales line. That is just what is true.

Why she is selling the last of them — and what she is thinking

Once it was clear the shed was closing, the question was simple: what happens to the 68 houses still on the bench? Storing them made no sense. Handing them out one at a time was not practical at that number.

A friend put her onto Backroad Goods — a small shop carrying handmade nature products. They handle the logistics. The price was Dulcie’s call. Not a collector’s mark-up, not a premium for scarcity. A price for someone who has an actual backyard and is actually going to hang it up.

“I built them so butterflies would live in them,” she says. “Not so they would sit on a shelf.”

Money was never why she built. It is not why she is selling now. What she wants is simpler: more Orchard Swallowtails over Australian backyards next spring. An Australian Painted Lady that finds shelter in April, in somebody’s garden, on a house somebody actually put up. No grand plan, no campaign. Just the hope that the work keeps going when she cannot.

What Dulcie’s customers are saying

Before it is too late — what to know

Spring is the only window in which a butterfly house can go up in time to matter this season.
What is still available is all there is.

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