Tiny scale-like protrusion on the upper bills of many baby birds to help them chip through the egg shell [1].
Rereferences[]
- ^ Simpson & Day (1999). A Field Guide to the Birds of Australia, 6th Edition. Penguin. ISBN 0-691-04995-5.
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This article is part of Project Glossary, an 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.
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