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− | A thin-walled structure joined to the lungs of a bird, involved in respiration. There are usually nine air sacs, which may extend into some of a bird's hollow bones. Birds that plunge-dive into water, such as |
+ | A thin-walled structure joined to the lungs of a bird, involved in respiration. There are usually nine air sacs, which may extend into some of a bird's hollow bones. Birds that plunge-dive into water, such as [[gannet]]s, have modified air sacs beneath their skin to help cushion the impact.{{Definitive}} |
==Reference== |
==Reference== |
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[[Category:Glossary]] |
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[[Category:Bird terminology]] |
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Latest revision as of 15:59, 3 October 2014
A thin-walled structure joined to the lungs of a bird, involved in respiration. There are usually nine air sacs, which may extend into some of a bird's hollow bones. Birds that plunge-dive into water, such as gannets, have modified air sacs beneath their skin to help cushion the impact.[1]
Reference
- ^ Frances, Peter; et al. (2007). Bird: The Definitive Visual Guide. Dorling Kindersley Inc. ISBN 1564582957.
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