Pied Avocet

The pied avocet (Recurvirostra avosetta) is an unmistakable long-legged wader with crisp black-and-white plumage and a long, thin bill that curves distinctly upward. Adults are about 42–45 cm long, have a wingspan of roughly 70–80 cm and weigh around 275 g. The head and rear neck form a black cap, while most of the body is white with bold black wing and back markings; the legs are pale blue-grey.

The species is monotypic and occurs across a broad Old World range from Europe and Africa through western and central Asia. Its unusual bill shape is closely linked to a specialised method of feeding in shallow water and soft sediment.

Pied avocets use shallow saline and brackish wetlands especially heavily, including estuaries, tidal mudflats, coastal lagoons, saltpans and saline lakes. They also breed and feed at some freshwater marshes and artificial wetlands. Suitable sites combine extensive shallow water with soft sediment rich in small invertebrates.

A study published in 2026 at the constructed Marker Wadden archipelago in the Netherlands found that newly created freshwater mudflats were heavily used for feeding, especially during the first years after their creation. The value of such sites can change as vegetation and sediment conditions develop over time.

The diet consists mainly of small aquatic invertebrates, including worms, crustaceans, aquatic insects and molluscs. Small amounts of plant material such as seeds and small roots are also taken. Prey type changes with water depth, salinity, sediment and season.

The avocet's characteristic feeding method is a rapid side-to-side sweep with the slightly open upturned bill while the bird walks through shallow water. A 1995 study in the Tagus estuary in Portugal found that prey are caught mechanically during each sweep, allowing the bird to take many small benthic animals while continuing to move the bill back and forth.

The sweeping angle, speed and depth can change with water conditions and prey distribution. Avocets can also peck and probe conventionally when particular prey or substrates make those methods more profitable. Together these techniques allow them to harvest small prey dispersed through soft sediment and the water immediately above it.

The species is partially migratory. Many birds breeding in northern and eastern Europe and temperate Asia move south or west after breeding, while populations in milder coastal regions may remain resident or make shorter movements. Wintering concentrations occur around the Mediterranean, Atlantic coasts, the Middle East, Africa and southern Asia.

European breeding distribution has expanded markedly in several regions. In Britain, where avocets returned as breeders in 1947, habitat protection and creation played an important role in recovery and expansion. Wider population changes and climate can also affect where birds breed, so the expansion is best understood as the result of several interacting factors rather than one cause.

Pied avocets are monogamous and often nest in loose colonies on sparsely vegetated islands, banks and open margins close to shallow water. Pairs defend the immediate nest area aggressively, while neighbouring birds can react collectively to predators. The nest is a shallow scrape, sometimes raised with shells, stones or plant material where flooding is a risk.

Clutches normally contain three or four eggs, with two to five recorded. Both parents incubate for about 23–25 days. The chicks hatch well developed and leave the nest soon afterwards. They feed for themselves but remain guarded and brooded by the adults and become capable of flight after roughly 35–42 days.

The pied avocet is classified as least concern on the IUCN Red List. It has a very large range, and some regional populations have expanded strongly where protected or newly created wetlands provide suitable feeding and nesting habitat.

Local colonies remain vulnerable to flooding, predation, disturbance, wetland drainage and changes in salinity or water level. Breeding therefore depends on shallow wetlands with sufficiently stable water conditions and suitable open nesting sites.