Calidris
Semipalmated sandpiper (Calidris pusilla), Jamaica Bay Wildlife Refuge
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Charadriiformes
Family:	Scolopacidae
Genus:	Calidris Merrem, 1804
Type species
Tringa calidris[1] = Tringa canutus Gmelin, 1789

Calidris is a genus of Arctic-breeding, strongly migratory wading birds in the family Scolopacidae. These birds form huge mixed flocks on coasts and estuaries in winter. Migratory shorebirds are shown to have decline in reproductive traits because of temporal changes of their breeding seasons.^[2] They are the typical "sandpipers", small to medium-sized, long-winged and relatively short-billed.

Their bills have sensitive tips which contain numerous corpuscles of Herbst. This enables the birds to locate buried prey items, which they typically seek with restless running and probing.^[3]

The genus Calidris was introduced in 1804 by the German naturalist Blasius Merrem with the red knot as the type species.^[4][5] The genus name is from Ancient Greek kalidris or skalidris, a term used by Aristotle for some grey-coloured waterside birds.^[6]

The genus contain 24 species:^[7]

• Great knot, Calidris tenuirostris
• Red knot, Calidris canutus
• Surfbird, Calidris virgata
• Ruff, Calidris pugnax
• Broad-billed sandpiper, Calidris falcinellus
• Sharp-tailed sandpiper, Calidris acuminata
• Stilt sandpiper, Calidris himantopus
• Curlew sandpiper, Calidris ferruginea
• Temminck's stint, Calidris temminckii
• Long-toed stint, Calidris subminuta
• Spoon-billed sandpiper, Calidris pygmaea
• Red-necked stint, Calidris ruficollis
• Sanderling, Calidris alba
• Dunlin, Calidris alpina
• Rock sandpiper, Calidris ptilocnemis
• Purple sandpiper, Calidris maritima
• Baird's sandpiper, Calidris bairdii
• Little stint, Calidris minuta
• Least sandpiper, Calidris minutilla
• White-rumped sandpiper, Calidris fuscicollis
• Buff-breasted sandpiper, Calidris subruficollis
• Pectoral sandpiper, Calidris melanotos
• Semipalmated sandpiper, Calidris pusilla
• Western sandpiper, Calidris mauri

v t e Genera of shorebirds and their extinct allies
Kingdom: Animalia Phylum: Chordata Class: Aves Infraclass: Neognathae Clade: Neoaves Order: Charadriiformes
Charadriiformes incertae sedis †Charadriisimilis †Eupterornis? †Fluviatitavis? †Jiliniornis †"Morsoravis" †Nahmavis †Palintropus? †Sarjeantopodus †Scandiavis †Volgavis? †Laornithidae? Laornis †Graculavidae? Dakotornis Graculavus Palaeotringa Telmatornis? Charadrii See below ↓ Scolopaci See below ↓ Lari See below ↓
Charadrii incertae sedis †Cherevychnavis Burhinidae Burhinus Esacus †Genucrassum Pluvianellidae Pluvianellus Chionidae Chionis †Chionoides †Neilus Pluvianidae Pluvianus Pluvianidae Vanellinae †Dolicopterus? Erythrogonys Hoploxypterus Vanellus †Viator Charadriinae Anarhynchus Charadrius †Dorypaltus Elseyornis †Jilniornis Oreopholus Peltohyas Phegornis Pluvialis Thinornis Recurvirostridae Cladorhynchus Himantopus †Kashinia Recurvirostra Ibidorhynchidae Ibidorhyncha Haematopodidae Haematopus
Scolopaci incertae sedis †Hakawai †Scolopacimilis Jacanidae Actophilornis Hydrophasianus Irediparra Jacana †Janipes Metopidius Microparra †Nupharanassa Pedionomidae †Oligonomus Pedionomus Rostratulidae Nycticryphes Rostratula Scolopacidae Actitis Arenaria Bartramia Calidris Coenocorypha †Elorius Gallinago Limnocryptes Limnodromus Limosa †Mirolia Numenius †Nuntius †Paractitis †Parvelorius Phalaropus Prosobonia Scolopax Tringa †Villetus Xenus Thinocoridae Attagis Thinocorus
Lari Alcidae †Divisulcus †Hydrotherikornis †Miocepphus †Pseudocepphus Alcinae Alcini Alca Alle †Pinguinus Uria Synthliboramphini Synthliboramphus Cepphini Cepphus Brachyramphini Brachyramphus Fraterculinae Aethiini Aethia Ptychoramphus Fraterculini Cerorhinca Fratercula †Mancallinae Alcodes Mancalla Miomancalla Praemancalla Dromadidae Dromas Glareolidae †Becassius †Boutersemia †Mioglareola †Paractiornis †"Precursor"? Glareolinae Glareola Stiltia Glareolinae Cursorius Rhinoptilus Laridae Anous Chlidonias Chroicocephalus Creagrus †Feducciavis †Gaviota Gelochelidon Gygis Hydrocoloeus Hydroprogne Ichthyaetus †Laricola Larosterna Larus Leucophaeus †Limicolavis? †Limosavis Onychoprion Pagophila Phaetusa †Pseudosterna Rhodostethia Rynchops Rissa Sterna †Sternalara Sternula Thalasseus Xema Stercorariidae Stercorarius Turnicidae †Cerestenia †Eocliffia? Ortyxelos †Turnipax Turnix