Passeriform - Plumage, Pterylosis, Molt

Passeriform - Plumage, Pterylosis, Molt: Plumage and the number and distribution of feathers of passerines are considered important taxonomic characters, especially in determining the genera, species, and subspecies. The passeriform vocal apparatus exists in four basic types: unspecialized, tracheophone, intermediate tracheobronchial, and oscine.
Passeriform, any member of the largest order of birds and the dominant avian group on Earth today. Passeriforms (or passerines) are true perching birds, with four toes, three directed forward and one backward. These birds occur in abundance on all continents except Antarctica and on most oceanic islands.

Pteryla, anatomy

Passerine - Wikipedia

Passeriform - Plumage, Pterylosis, Molt

Introduction to the Morphology, Development, and Ecology of Feathers

Feather Evolution from Precocial to Altricial Birds. - Abstract - Europe PMC

Passeriform - Plumage, Pterylosis, Molt

Plumages, Molts, and Structure - Morelet's Seedeater - Sporophila morelleti - Birds of the World

Schematic diagram of feather tract and types of natal down formation in

Glossary of Bird Terms

Reinterpretation of purported molting evidence in the Thermopolis Archaeopteryx

Passeriformes

Powdermill Banding Highlights Spring 2005

Plumages, Molts, and Structure - Unicolored Jay - Aphelocoma unicolor - Birds of the World