The calidrids or typical waders are strongly migratory wading birds that breed in the Arctic.
They form large mixed flocks on coasts and estuaries in winter.
They are small to medium-sized, long-winged and relatively short-billed.
- Genus Calidris sensu stricto - knots
Other calidrids (all at some time placed in Calidris too)
- Stints - possibly genus Erolia
- Semipalmated Sandpiper, "Calidris" pusilla
- Little Stint, "Calidris" minuta
- Least Sandpiper, "Calidris" minutilla
- White-rumped Sandpiper, "Calidris" fuscicollis
- Baird's Sandpiper, "Calidris" bairdii
- Dunlin, "Calidris" alpina
- Red-necked Stint, "Calidris" ruficollis
- Long-toed Stint, "Calidris" subminuta
- Pectoral Sandpiper, "Calidris" melanotos
- Sanderling, "Calidris" alba ("Crocethia alba")
- Western Sandpiper, "Calidris" mauri
- Purple Sandpiper, "Calidris" maritima
- Rock Sandpiper, "Calidris" ptilocnemis
- Temminck's Stint, "Calidris" temminckii
- Buff-breasted Sandpiper, "Tryngites" subruficollis
- Genus Philomachus
- Genus Micropalama (doubtfully valid; Erolius sensu stricto?)
- Stilt Sandpiper, Micropalama himantopus / Calidris himantopus
- Genus Eurynorhynchus (doubtfully valid)
- Spoon-billed Sandpiper, Eurynorhynchus pygmeus
- incertae sedis (Erolia sensu stricto?)
- Curlew Sandpiper, ?Calidris ferruginea
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