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.

Molt patterns and age and sex determination criteria for selected landbirds in an urban area of the Peruvian Central Coast

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

Glossary of Bird Terms

Bird Plumage Variations and Abnormalities

Preformative molt in Neotropical Cardinalidae

Passeriform - Songbirds, Adaptations, Foraging

Pteryla, anatomy

Long-tailed paradise whydah - Wikipedia

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

Powdermill Banding Highlights Spring 2005

Migration Research Foundation - McGill Bird Observatory - Photo Library - Reference section

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

Glossary of Bird Terms

Glossary of bird terms - Wikipedia

Rarity of molt evidence in early pennaraptoran dinosaurs suggests annual molt evolved later among Neornithes