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Zonotrichia albicollis black-and-white-striped morph
Zonotrichia albicollis brown-and-tan-striped morph

One of or two more consistent variations in plumage colour showing up in a species, such as as light and dark morphs or red or grey morphs, especially in seabirds and hawks[1] .

References[]

  1. ^ Stokes, Donald W. and Stokes, Lilian Q. (2010). Stokes Field Guide to the Birds of North America. Little, Brown and Company. ISBN 9770316010504 Check |isbn= value: invalid prefix (help). 


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