A small group of two-six feathers projecting from a bird's 'thumb', at the bend of its wing. When raised, the alula reduces turbulence, by enabling fine control of the airflow over the wind. It is also called the bastard wing .
|This article is part of Project Glossary, a All Birds project that aims to write comprehensive articles on each term related to animals.|
|This article is part of Project Anatomy, a All Birds project that aims to write comprehensive articles on each anatomical term related to birds.|
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