Red Knot - BirdForum Opus

C. c. canutus, post-breeding adult
Photo © by the late Jim Wood
Shetland, UK; 5 August 2013.

Calidris canutus

Identification

Winter adult, presumed C. c. islandica by location & date
Photo © by IanF
Hartlepool, Cleveland, UK; 5 April 2008

Length 23–26 cm (9-10¼ in), wingspan 47–53 cm, weight 85–220 g

Black bill
Olive-green legs

Summer
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
Winter
Reddish parts become plain grey above and white below; pale grey rump obvious in flight
Juvenile
Similar to adult winter, but upperpart feathers fringed with narrow dark inner and pale outer fringes, giving a scalloped pattern
Subadult
Similar to adult winter; one-year-old birds do not develop summer plumage, and typically remain on the wintering grounds through their first summer

Distribution

Juvenile, presumed C. c. roselaari by location
Photo © by Rodrigo Conte
Aruba, Caribbean; 21 September 2014

Breeds in the high Arctic of Russia, Alaska, Canada, and Greenland; rarely in the Western Palearctic but there are old breeding records for Svalbard.

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.

Vagrant to various Cyprus and the Near East countries, Madeira and Cape Verde Islands. Vagrant or rare but regular winter visitor to the Azores.

Taxonomy

Most closely related to the Great Knot - Surfbird species pair.

Subspecies

Juvenile, presumably Nominate subspecies due to timing
Photo © by Joe52
Bournemouth, Dorset, August 2018

There are six subspecies, eastwards from the Greenwich meridian^[1]:

C. c. canutus
Breeds northwest Siberia (Taimyr Peninsula & Severnaya Zemlya), migrates via north and west Europe to the Atlantic coast of west Africa (south to South Africa
C. c. piersmai
Breeds north-central Siberia (Yakutia & Novosibirskiye Islands), migrates via eastern China to the Indian Ocean coast of Australia
C. c. rogersi
Breeds northeast Siberia (Chukotskiy Peninsula & Wrangel Island), migrates via Korea to the Pacific Ocean coast of Australia and New Zealand
C. c. roselaari
Breeds Alaska, migrates via western North America to the southwestern Caribbean
C. c. rufa
Breeds north-central Canada, migrates via southeastern United States (some also wintering) to southern South America; has also been reported from Britain
C. c. islandica
Breeds northeastern Canada, migrates via Iceland to northwestern Europe

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.

Habitat

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.

Behaviour

Diet

Their diet consists mostly of insects, such as worms, beetles, spiders, bees, snails and small crustaceans.

Breeding

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.

Vocalisation

Gallery

Click on photo for larger image

C. c. rogersi, adults moulting into summer plumage
Photo © by flossiepip
Waipu, Northland, New Zealand; 8 March 2013

References

Clements, J. F., T. S. Schulenberg, M. J. Iliff, T. A. Fredericks, J. A. Gerbracht, D. Lepage, S. M. Billerman, B. L. Sullivan, and C. L. Wood. 2022. The eBird/Clements checklist of Birds of the World: v2022. Downloaded from https://www.birds.cornell.edu/clementschecklist/download/
Collins Pocket Guide to British Birds 1966
Handbook of the Birds of the World Alive (retrieved Aug 2018)

List of references

Recommended Citation

BirdForum Opus contributors. (2024) Red Knot. In: BirdForum, the forum for wild birds and birding. Retrieved 19 April 2024 from https://www.birdforum.net/opus/Red_Knot

External Links

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