Smithsonian Report, 1910. — Duerden. 



Plate 1. 



1. Natal or Birth Feathers, Consisting of Tufts of Plumules without 

 any Shaft but with a Short Terminal Quill. 



Some of the plumules are continued into bristle-like portions, which produce the bristly 

 appearance of the chick as a whole. All the feathers of the chick on hatching are of 

 this type. 



2. Group of Chicks a Fortnight Old, Showing the Bristly Nature of the 

 Natal or Birth Plumage. 



Owing to the heat of the day when the photograph was taken the feathers are standing 

 erect and allow the naked parts of the skin (apteria) to be seen, both behind and at 

 the sides. 



