The term generally has variable usage, though it generally indicates the crown, nape, and lower chin (excluding the forehead, eyes and chin) [1]
Rereferences[]
^Garrigues, Richard and Dean, Robert (2007). The Birds of Costa Rica. Zona Tropical Publication. ISBN9780801473739. CS1 maint: Multiple names: authors list (link)
This article is part of Project Glossary, an All Birds project that aims to write comprehensive articles on each term related to animals.