Pathway · about 15 minutes · 5 steps
Birds of the flyway
Stand on a mudflat and read a hemispheric migration — why a bleak-looking salt flat helps feed the Arctic.
Start with the name, because it corrects the eye before it corrects anything else: Winaityinaityi Pangkara, “a country for all birds,” a proclaimed sanctuary, not the vacant lot it’s so often mistaken for. Then walk the flat itself — the samphire and the mangrove working two tricks on the same problem of too much salt, and between them building the mudflat larder underneath everything that follows. Now meet the traveller: the grey plover, fattening here on buried worms before a non-stop run to the Yellow Sea and on to the Russian Arctic, the flyway made flesh. Then meet the ones who never leave — the slender-billed thornbill, so tied to this samphire it’s listed as vulnerable, and the white-fronted chat, which needs the open bare ground the thornbill won’t touch, proof that “saltmarsh” is several habitats stacked, not one.
Take it with you. Next low tide, look twice at the birds working the mud: some are locals, some have just flown from the far side of the world, and the flat holds them both. Close the page and go outside.
- Winaityinaityi Pangkara — the bird sanctuary — A stretch of tidal flat and saltmarsh north of Adelaide, proclaimed in 2016 as the Adelaide International Bird Sanctuary — Kaurna name Winaityinaityi Pangkara, 'a country for all birds' — where tens of thousands of shorebirds make landfall at the southern end of a hemisphere-spanning flyway.
- The samphire coast — The salt-soaked frontier where Gulf St Vincent meets the plains — samphire flats, the world's most southerly mangroves, and a mudflat larder that fuels shorebirds all the way to the Arctic.
- Grey plover — A modest grey-and-white wader that fattens on Adelaide's mudflats and then flies thirteen thousand kilometres to breed in the Russian Arctic — the flyway made flesh.
- The slender-billed thornbill — A dun, unremarkable-looking little bird bound so tightly to Gulf St Vincent's samphire that it is listed as vulnerable — and, in 2024, found holding on in more places than anyone knew.
- White-fronted chat — A small, sharp-suited bird of the open samphire and saltmarsh flats, bouncing low over the crimson ground on a thin, tinkling call — proof the 'wasteland' coast has specialists of its own.
The end-check — put it together
You've walked the steps. Now answer these from what the pathway taught, not from the pages — getting them here is what tells you it stuck.
A grey plover satellite-tagged on Adelaide's mudflats at Thompson Beach does not fly straight from Gulf St Vincent to its Arctic breeding grounds. What does the tracking data actually show?
The whole one-way journey runs past 13,000 km, but the bird does not cover it in one leap — it stages the trip, converting Adelaide's mudflat invertebrates into fat, then launching a single unbroken flight of roughly 7,000 km to the Yellow Sea, the one place on the route where nearly every bird on the flyway must refuel, before pushing on to breed on the Siberian tundra. The same tracking also helped revise which breeding population these Australian non-breeding birds belong to. (Li et al. 2025.)
In 2024, surveyors combing Gulf St Vincent's samphire flats turned up around 620 slender-billed thornbills across a dozen sites — far more than the handful of locations old records held. What does this finding actually mean for the bird?
The 2024 survey found roughly 620 individuals across 12 sites simply because, for the first time, someone looked properly — not because the population had boomed (Green Adelaide 2024). The bird remains entirely dependent on samphire, and that habitat is still losing ground at its seaward edge as sea level rises, with Australia's coastal saltmarsh formally listed as a threatened ecological community (Delta 2017). A narrow specialist with no fallback address does not become safer just because it was finally counted properly.
The white-fronted chat shares the samphire flat with other small birds, but it is not really competing with them for the same ground. What kind of ground does the chat specifically need, and how does that set it apart from its saltmarsh neighbours?
The chat forages on foot for invertebrates over open, low, sometimes near-bare salt-ground rather than hiding in cover, which is exactly the ground the slender-billed thornbill and the mangrove's own specialists don't use. That single distinction is the point: 'saltmarsh' is not one uniform habitat but several stacked microhabitats — open flat, dense samphire, tidal mangrove edge — each read by a different bird, and the coastal saltmarsh community all three depend on is listed nationally Vulnerable (Threatened Species Scientific Committee / DCCEEW 2013).