Pied avocet in the context of Mudflat


Pied avocet in the context of Mudflat

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⭐ Core Definition: Pied avocet

The pied avocet (Recurvirostra avosetta) is a species of wader in the Recurvirostridae family, the only member of the genus Recurvirostra found in Europe.

This characteristic wader of coastal lagoons and marshes is easily recognizable by its long, upturned bill, long legs, and striking black-and-white plumage. Measuring approximately 40 cm (16 in) in length with a wingspan of about 70 cm (28 in), it is a relatively large species that feeds on various invertebrates in water and mudflats, captured using its distinctive bill. It typically nests in colonies of 10 to 70 pairs on islets or dikes near water, laying usually four eggs in a simple, shallow scrape in the sand. Highly territorial when defending its chicks against conspecifics or predators—such as various raptors, corvids, and mammals—the pied avocet has a lifespan of about 20 years, with a record of 27 years.

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Pied avocet in the context of Webbed foot

The webbed foot is a specialized limb with interdigital membranes (webbings) that aids in aquatic locomotion, present in a variety of tetrapod vertebrates. This adaptation is primarily found in semiaquatic species, and has convergently evolved many times across vertebrate taxa.

It likely arose from mutations in developmental genes that normally cause tissue between the digits to apoptose. These mutations were beneficial to many semiaquatic animals because the increased surface area from the webbing allowed for more swimming propulsion and swimming efficiency, especially in surface swimmers. The webbed foot also has enabled other novel behaviors like escape responses and mating behaviors. A webbed foot may also be called a paddle to contrast it from a more hydrofoil-like flipper.

View the full Wikipedia page for Webbed foot
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