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 [1].
Reference
- ^ France, Peter; et al. (2007). Bird: The Definitive Visual Guide. Dorling Kindersley Inc. ISBN 9780756631536.
This article is part of Project Glossary, a All Birds project that aims to write comprehensive articles on each term related to animals. |
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This article is part of Project Anatomy, a All Birds project that aims to write comprehensive articles on each anatomical term related to birds. |