A shorebird standing quietly on a sandbank may be doing exactly what its journey requires. Flight is only one stage of migration. Feeding places supply the energy for another leg, while nearby roosts provide somewhere to wait when the tide covers the food.
The longest flights attract attention, but a migration route also depends on the stops between them. A wetland can matter far beyond its size or the number of weeks birds spend there.
Australia’s summer visitors belong to a wider flyway
DCCEEW’s migratory shorebird account describes the East Asian–Australasian Flyway, linking breeding areas in northern Asia and Alaska with non-breeding grounds farther south.
Arrivals become conspicuous in Australia’s spring; northward movements follow in late summer and autumn. Timing varies by species, population and place, with Australia’s north receiving migrants before the south.
Not every bird along an Australian shore makes an international migration. Some shorebirds breed here. The NSW wetland account distinguishes resident species, migratory visitors and other wetland birds with different breeding systems. A bird on a beach is not automatically an Arctic migrant, and a local nest needs protection regardless of a migration calendar.
Refuelling means building reserves before another flight
Migrants convert food into body reserves, including fat, that support sustained flight. DCCEEW describes intense feeding before departure and renewed fat stores at Asian stops. Refuelling takes usable habitat and time; a brief landing is not equivalent to obtaining enough food for another leg.
Suitable breeding and non-breeding grounds can still leave a gap where reserves need replenishing between them. Protecting the route means considering that chain of usable places.
The tide creates a feeding window
The tide alternately exposes feeding flats and covers them. The same flock may then move elsewhere to roost.
BirdLife’s Encounter Marine Park guide describes the connection between feeding places and high-tide resting sites. A quiet flock on a small dry patch may have fewer options while its feeding habitat is submerged.
Scroll sideways, or focus the table and use arrow keys, to compare all columns.
| Part of the habitat | What it supplies | What a quick visit can miss |
|---|---|---|
| Exposed tidal flat | Access to food during suitable water levels | The same area may be underwater later. |
| High-tide roost | A place to rest while feeding areas are covered | Birds can need the dry site even though they are not eating there. |
| Routes between them | Access to both resources through a tidal cycle | A photograph of either endpoint does not describe the whole day’s use. |
A visit at one tide can miss another part of the system. Leave room around both feeding birds and resting flocks.
Food-rich does not mean every flat is equivalent
The Far Eastern Curlew profile gives a concrete example. Curlews use their long, down-curved bills to probe mud, taking small crabs and molluscs. They also pick food from the surface and can feed by night as well as day.
That feeding method depends on access to prey, not simply the presence of a shoreline. The species uses sheltered intertidal mudflats and sandflats, often around estuaries and mangroves. Replacing an exposed feeding area with a different-looking wet place does not demonstrate that the same food can be obtained there.
Other shorebirds use different habitats and food opportunities. NSW describes migratory sandpipers and plovers using suitable inland wetlands too, including muddy margins revealed as floodwater recedes. A coastal example should not erase those inland connections.
A stopover bottleneck can appear in distant counts
Studds and colleagues’ 2017 research analysed 1993–2012 shorebird counts from Australia and New Zealand and compared trends among ten migratory taxa. Taxa more dependent on Yellow Sea refuelling habitat generally had steeper declines than those less dependent on it.
The finding supports concern that changes at a migration stopover can limit birds counted far away on their non-breeding grounds. It also explains why conserving an Australian estuary alone cannot secure every stage of a migration.
This was a comparison of long-term counts, migration-network information and population models. It did not follow the fate of every counted bird or show that one disturbance caused a particular individual’s death. The study period and differences among taxa matter; its historical rates should not be presented as a current count of every species.
Departing earlier does not always mean arriving earlier
Conklin, Lisovski and Battley’s 2021 study combined observations of Bar-tailed Godwit departures from a New Zealand estuary with 50 complete northbound tracks from 36 birds in four study years. Departure advanced during the longer 2008–2020 observation series. Among the tracked birds, longer Asian stopovers countered earlier departure, and arrival in Alaska did not advance in the same way.
This is a specific population and northbound journey, not a timetable for all Australian godwits. It illustrates how travel and refuelling stages interact: a changed start does not automatically carry through to the finish. The authors considered alternative explanations for the stopover change rather than treating its cause as settled.
Make the sighting useful without making birds move
Note the broad place, date, tide, whether birds were feeding or resting, and which features you could actually see. One unmarked bird cannot reveal its last stop or its next destination. Repeated counts and individually marked birds answer different questions.
Follow the Canberra Ornithologists Group’s guidance: keep distance, avoid flushing flocks and move back if feeding stops or birds become alert. Obey closures and local dog restrictions. Accept an uncertain identification from a distant view.
For a comparison with local ground nesting, see the Masked Lapwing guide. Refuelling visitors and adults guarding chicks can both need space on a wetland walk.