A warm home for our garden birds
A warm home for our garden birds: why this small alpaca heart is turning up in backyards across Australia
Australian backyards have never had more bird baths in them. Millions of them, topped up right through summer. But when nesting season starts in spring, something else decides whether the chicks survive — and almost nobody thinks about it. Not what the birds drink. What their nest is built from.
The quiet danger your bird bath can’t fix
A bird bath solves thirst. It does nothing for the weeks before the eggs are laid, when a pair of birds is hunting for something soft enough to line a nest with. And in a tidy Australian backyard, that search mostly fails.
The loose, untidy material birds once built with — fine grasses, plant down, animal hair — has been mulched, mown and tidied away. What is left within easy reach is baling twine, fruit netting, shade cloth fraying into single plastic threads, and offcuts of synthetic garden string. Birds can’t tell the difference. They take what they find.
What that costs is hard to sit with. Synthetic fibre doesn’t break down inside a nest and it doesn’t compress. A thin strand winds around a leg or a throat and tightens rather than loosens. Wildlife carers have a name for it: fibre entanglement. It isn’t rare, and almost no backyard birdwatcher has heard of it.
“Fibre entanglement is something we see every single spring. Chicks come in with synthetic thread wound around a leg or a throat, and almost always it has come from nesting material a parent bird collected in a nearby garden. Natural fibre like alpaca fleece compresses and breaks down safely. Synthetic fibre does neither. It really is that simple.”
Dr Alison Renshaw, Ph.D. Avian Ecologist & Wildlife Rehabilitator · Highlands Wildlife Care Centre, Bowral, NSWWhat birds are actually looking for — and it was never string
Left to itself, a bird doesn’t line a nest with grass. It lines it with animal hair. Fur, wool, whatever it can pull off a fence wire, a hedge, or the back of a living animal. Hair is hollow, it traps warmth, it dries fast after rain, and it collapses softly around a chick instead of holding a loop.
The willie wagtail is so committed to it that it doesn’t wait for the hair to drop. It lands on the back of a horse, a cow or an alpaca and pulls the tufts straight off. Anyone who runs stock in this country has watched it happen.
That is the material that has quietly gone out of the Australian backyard. Fewer paddocks within reach, tidier gardens, everything mulched and mown. The birds still look for it every spring. Most of them never find it.
Which is the whole reason a retired primary school teacher in the Southern Highlands ended up hanging wool on a fence post.
Robertson, New South Wales, September. The verandah wraps right around the house, the way they built them up here in the Highlands. Robyn Hartley has a chair at the northern end, angled toward the paddock, and every morning since she finished up at the school in 2019 she has sat there with her tea and watched.
She has always noticed things other people walk straight past. Thirty-four years teaching primary school will do that. But it wasn’t until that first spring with nowhere to be and no bell to beat that she had the time to properly look.
What she saw stopped her cold.
The morning a wagtail landed on her alpaca — and started pulling
Don had kept a small herd on the place since 2003 — fourteen alpacas on two hectares, more hobby than business. He spent forty-odd years putting up fences across the Southern Highlands. Wire is the one material that has never run short around the shed.
That first spring of Robyn’s retirement, she watched a willie wagtail drop onto the back of one of the wethers and stay there. She assumed it was after insects. Then it lifted off with a tuft of fleece in its beak and flew straight for the hawthorn.
It came back the next morning. And the morning after that. For a fortnight.
“The birds worked it out long before I did. I just finally noticed what they’d been telling me.”
So Don cut a heart out of an offcut of fencing mesh — freehand, about four minutes’ work — packed the hexagons full of fleece from that year’s clip and hung it on the post by the hawthorn with a length of chain. Partly as a retirement present. Mostly so the wagtails would stop climbing all over the alpacas.
It came out crooked. He never straightened it.
He used four fleeces, because that was what was sitting in the shed: dark brown off Barney, cream off one of the white girls, caramel, and the charcoal grey from the old wether the wagtails liked best. Four colours in one heart. Robyn has packed every one the same way since.
The nest in the hawthorn was lined with her own paddock
Within a fortnight the heart had been pulled nearly bare.
Robyn watched it happen from the verandah. Trip after trip to the fence post, each one ending in the fork of the hawthorn by the gate. By the time the nest was finished she could see it from her chair.
A neat cup. Grey on the outside, where the spider web holds it together. And inside, lined thick with soft cream fleece off her own paddock.
Three eggs. All three hatched.
Robyn spent five years quietly solving a problem most Australian gardeners don’t know exists. What she built is still available — but only from the final shearing of their herd.
See Robyn’s Nesting Heart →The one material birds hunt for every spring — and almost never find
Alpaca fleece is different in nearly every way that matters to a nesting bird:
- Naturally hollow fibre — alpaca fleece is hollow through the core, so it insulates far better than most materials. A nest lined with it holds warmth through a cold Highlands night, which matters enormously for eggs and newly hatched chicks.
- No lanolin, no additives — unlike sheep’s wool, alpaca fleece carries no lanolin. It is soft, clean and gentle against a chick’s skin from its first day out of the shell.
- Breaks down safely — where synthetic thread stays rigid, alpaca fleece compresses and breaks down naturally inside the nest. It doesn’t hold a loop and poses no entanglement risk.
- Soft enough for lining — birds use coarse material for the outer structure and line the inside with the softest thing they can find. Alpaca fleece sits at the very top of that list, which is exactly why the wagtails go after it at the source.
- Sheds moisture — alpaca fibre repels water naturally, so the lining stays dry through spring rain rather than turning into a cold, wet mat.
“Birds don’t need any of this explained to them,” Robyn says. “The first heart we ever hung out had a wagtail on it inside the hour.”
“The neighbours started asking. Then the neighbours’ neighbours.”
Robyn made more hearts after that first spring. Don cut the frames from mesh offcuts; she packed the hexagons with the season’s fleece, four colours to a heart. One went on the post by the road. One in the old apple tree. One on the corner of the shed.
By November she had more nesting activity on the place than she had ever seen. Wagtails, fairy-wrens, a pair of eastern spinebills that had never bothered with the garden before.
Then the neighbours started noticing. Then asking. Then pulling up at the gate.
“I gave them away for five years,” Robyn laughs. “It never occurred to me to sell them. I had a paddock full of alpacas and a husband who could bend wire. It seemed like the obvious thing to do.”
It was their daughter Kate who finally put her foot down. Christmas 2024, she sat at the kitchen table with her laptop and set the shop up while Robyn was doing the pavlova. “She didn’t even tell me she was doing it,” Robyn says. “She just turned the screen around when it was finished.”
“I’d rather it went to the birds than into a skip.”
Robyn and Don are moving after Christmas — down to the coast, closer to Kate and the grandchildren at Wollongong. Two hectares has quietly become too much. The fourteen alpacas are going to a friend’s place over at Moss Vale, near enough that they can call in on them.
December’s clip was the last one. Every heart left is made from that fleece. When they are gone, there won’t be more — there is no next season to make them from.
“People ask whether I’m sad about it,” Robyn says. “I’m not. The next part is starting. I just wanted the last of them to go to people who’ll actually hang them out.”
This is what customers said about it.
🍃“Hung one on the back fence a fortnight ago and within three days I had a wagtail coming every morning. I’ve had a bird bath out there for years and never seen that kind of carry-on. My granddaughter is obsessed — she wants to check it before school.”
🍃“I’d never given nesting material a single thought. Once I read about the netting I couldn’t stop noticing it in my own garden. Put one in the lemon tree and by the end of the week something had started building. The heart itself is lovely too — it stays up all year.”
🍃“Bought two — one for me, one for Mum, who is the real birdwatcher. She went quiet when I told her the story behind them. The fleece is nothing like the stuff you get at a garden centre. You can tell someone actually made these.”
Robyn’s Alpaca Nesting Heart
Hand-cut wire-mesh frame · Four undyed fleece colours · Refillable · Hangs from a chain
From the final shearing of the Hartley herd · Limited quantity · Ships from New South Wales
* This is a sponsored story. Product available while stocks last. All alpaca fleece is from the Hartley family herd at Robertson, NSW.