The Red Knot (Calidris canutus) is an Australian bird or regular visitor that can be identified most reliably by combining shape, plumage, habitat and behaviour. A compact, medium-sized sandpiper with a straight black bill and short dark legs; non-breeding birds are smooth grey above and white below, while breeding adults become rich brick-red underneath. Adults are typically about 23–26 cm long, although posture, sex, age and plumage can affect how large an individual appears in the field.
How to identify a Red Knot
A compact, medium-sized sandpiper with a straight black bill and short dark legs; non-breeding birds are smooth grey above and white below, while breeding adults become rich brick-red underneath. Start with overall silhouette before focusing on colour. Check the bill, legs, tail, wing shape and any bold head or body pattern. Distance, shade, glare and strong Australian sunlight can change the apparent colour of feathers, so several matching features are more useful than a single mark.
Red Knots often feed and roost in tight flocks, moving across intertidal flats as the tide falls and returning to secure roosts as water rises. Behaviour can be one of the quickest ways to confirm an identification because closely related birds often feed, fly or perch differently even when their plumage looks similar.
Where is the Red Knot found in Australia?
A regular non-breeding migrant on Australian coasts, especially at large estuaries and tidal flats in eastern, southern and north-western regions.
Typical habitat includes tidal mudflats, sandy estuaries, coastal lagoons, shell banks and high-tide roosts. Distribution can shift with rainfall, drought, breeding conditions, migration, tides and local food supply, so an apparently unusual sighting should be checked against season as well as location.
What does the Red Knot eat?
Small bivalves, snails, crustaceans, worms and other invertebrates probed from wet sediment. Watching exactly how a bird feeds can provide another useful clue. Note whether it runs and pecks, probes mud, sweeps its bill, plunge-dives, surface-dips or catches food in flight. Feeding technique often separates species that share the same habitat.
Wild birds do not need processed human food. Protecting natural habitat, clean water and native food sources is usually a better way to support them than regular feeding.
Behaviour and calls
Red Knots often feed and roost in tight flocks, moving across intertidal flats as the tide falls and returning to secure roosts as water rises.
Calls are soft, low contact notes, often given as flocks lift from the flats. Voice can be especially useful when distance, a crowded flock or low light makes visual identification difficult. Try to notice the rhythm and tone as well as a written approximation of the sound.
Nesting and breeding
Breeding occurs in the Arctic; birds visiting Australia undertake some of the world’s longest shorebird migrations. Breeding timing varies according to latitude, climate and species. Many migratory shorebirds seen in Australia breed in the Northern Hemisphere, while resident terns and seabirds may nest on Australian beaches or offshore islands. If you find a nest or dependent young, observe from a respectful distance.
Similar birds
Great Knots are larger and more heavily streaked, while Curlew Sandpipers are smaller with a distinctly downcurved bill.
When two species remain difficult to separate, compare photographs against multiple field marks rather than choosing on colour alone. Geographic range, voice, habitat and feeding style may be more decisive than one feather pattern.
Quick identification tip
Remember three things: its approximate size is 23–26 cm; its key visual clue is a compact, medium-sized sandpiper with a straight black bill and short dark legs; non-breeding birds are smooth grey above and white below, while breeding adults become rich brick-red underneath.; and a typical setting is tidal mudflats, sandy estuaries, coastal lagoons, shell banks and high-tide roosts. Matching all three gives a much stronger identification than any one clue by itself.
Sources and further reading
For additional Australian bird information and conservation guidance, see BirdLife Australia bird profiles and the Australian Museum bird collection. Image licensing and creator information for this page is recorded from the linked Wikimedia Commons file page.
