- Calidris canutus
Length 23–26 cm (9-10¼ in), wingspan 47–53 cm, weight 85–220 g
- Black bill
- Olive-green legs
Brick-red to orangey-chestnut head and breast; black, orange and grey spangled upperparts, white under-tail coverts and grey wings with a light bar and dark tips
Reddish parts become plain grey above and white below; pale grey rump obvious in flight
Similar to adult winter, but upperpart feathers fringed with narrow dark inner and pale outer fringes, giving a scalloped pattern
Similar to adult winter; one-year-old birds do not develop summer plumage, and typically remain on the wintering grounds through their first summer
A passage migrant and winter visitor to many of the World's coasts; rare inland but will use large freshwater lakes on passage.
For the main wintering areas, see for each subspecies below. Common on passage in the Baltic and on northwest European coasts in July to September, with smaller numbers again in May.
There are six subspecies, eastwards from the Greenwich meridian:
- C. c. canutus
- C. c. piersmai
- C. c. rogersi
- C. c. roselaari
- C. c. rufa
- C. c. islandica
The subspecies differ slightly in size (C. c. piersmai smallest, C. c. roselaari largest), and in the intensity of the summer plumage colours. They cannot be separated in winter or juvenile plumages; their wintering ranges are known from ringing studies. In Britain, two subspecies occur, but at different times of year, with C. c. canutus on passage in late summer and late spring, and C. c. islandica wintering from late autumn until early spring.
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Breeds in, sparsely vegetated foothills and high, rocky plateaux. On passage and in winter found on sandy and muddy shores, on wide estuaries and mudflats. Also on shingle beaches and sometimes on coastal grassland.
Their diet consists mostly of insects, such as worms, beetles, spiders, bees, snails and small crustaceans.
Three to four eggs are laid in a shallow lined scrape. They are incubated by both adults. The male tends the young until they fledge.
- Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2018. The eBird/Clements checklist of birds of the world: v2018. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
- Collins Pocket Guide to British Birds 1966
- Handbook of the Birds of the World Alive (retrieved Aug 2018)
- BirdForum Opus contributors. (2021) Red Knot. In: BirdForum, the forum for wild birds and birding. Retrieved 16 October 2021 from https://www.birdforum.net/opus/Red_Knot