A circular colour patch, fleshy or feathered, surrounding the eye, e.g. inconspicuous (Broad-billed Flycatcher or conspicuous (female Australian Shelduck, Silvereye) 
- ^ Simpson & Day (1999). A Field Guide to the Birds of Australia, 6th Edition. Penguin. ISBN 0-691-04995-5.
|| 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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