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.

Anything Larus: Preformative Molt and Bonaparte's Gull

Plumages, Molts, and Structure - Tawny Antpitta - Grallaria quitensis - Birds of the World

Glossary of bird terms - Wikipedia

Glossary of Bird Terms

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

OFO - Page Site

Molt strategy and delayed plumage maturation in the Lined Seedeater - Journal of Field Ornithology

Pictorial Highlights_ August_2003

Plumages, Molts, and Structure - American Pipit - Anthus rubescens - Birds of the World

Long-tailed paradise whydah - Wikipedia

Molt strategy and delayed plumage maturation in the Lined