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Alula

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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

  1. ^ France, Peter, et al. (2007). Bird: The Definitive Visual Guide. Dorling Kindersley Inc.. ISBN 9780756631536. 


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