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have the white colour more mixed with brown; the tertiaries 

 have their outer webs bluish grey. 



The young bird is said to have the bill pale brownish red; 

 head, neck, and nape, pale yellowish olive brown; throat, 

 yellowish, bounded by a small line of brown spots, indica- 

 tive of the future black patch; the breast, dull white, the 

 feathers, especially on the sides, tipped with small brown 

 spots. The bar on the wings is less apparent than in the 

 old birds. 



Varieties occur which are pure white, some yellowish'white, 

 or greyish; others with the wings or tail white, and others 

 with white feathers here or there. 



