Delicate, comblike structures inside the bill of some birds such as flamingos, ducks and geese; they are used to filter out tiny food particles out of water  Compare with baleen.
- ^ Frances, Peter; et al. (2007). Bird: The Definitive Visual Guide. Dorling Kindersley Inc. ISBN 1564582957.
|| 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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