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It is one of four species ofavocet that make up the genusRecurvirostra.[5] The genus name is fromLatinrecurvus, "curved backwards" androstrum, "bill".[6] A 2004 study combining genetics and morphology showed that it was the most divergent species in the genus.[7]
The pied avocet is a striking white wader with bold black markings. Adults have whiteplumage except for a black cap and black patches in the wings and on the back. They have long, upturnedbills and long, bluish legs. It is approximately 16.5–17.75 in (41.9–45.1 cm) in length of which the bill is approximately 2.95–3.35 in (7.5–8.5 cm) and the legs are approximately 3–4 in (7.6–10.2 cm). Its wingspan is approximately 30–31.5 in (76–80 cm).[8] Males and females look alike. The juvenile resembles the adult but with more greyish and sepia tones.
The call of the avocet is a far-carrying, liquid, melodiouskluit kluit.[8]
These birds forage in shallow brackish water or on mud flats, often scything their bills from side to side in water (a feeding technique that is unique to the avocets[9]). They mainly eatcrustaceans andinsects.
Theirbreedinghabitat is shallow lakes with brackish water and exposed bare mud. They nest on open ground, often in small groups, sometimes with other waders. Three to fiveeggs are laid in a lined scrape or on a mound of vegetation.
The pied avocet wasextirpated as a breeding species in Great Britain by 1840.[10] Its successful recolonisation atMinsmere,Suffolk, in 1947 led to its adoption as the logo of theRoyal Society for the Protection of Birds.[8] The pied avocet has spread inland and northwards and westwards in Britain since then and it has bred inWales[11] and inScotland in 2018 atSkinflats.[12] Avocets have been sighted wintering at Browhouses, Dumfries and Galloway.