The Sanderling (Calidris alba, syn. Crocethia alba or Erolia alba) is a small wader. It is a circumpolar Arctic breeder, and is a long-distance migrant, wintering south to South America, South Europe, Africa, and Australia. It is highly gregarious in winter, sometimes forming large flocks on coastal mudflats or sandy beaches.
It is somewhat unlike other sandpipers in appearance, which has led to the suggestion that it should be placed into a monotypic genus Crocethia.
The species typically chooses nesting sites on dry stony areas near wet areas, from 60 m above sea level to 800 m. During the winter and its migration it is most commonly found on coastal sandy beaches, but also occurs on tidal sand flats mud flats and the shores of lakes and rivers. More infrequently it make occur on rocky shores.
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