518 



BRITISH BIRDS. 



plumage differ from adults in having the primaries more or less tipped 

 with black, with black shafts to these feathers and the secondaries, in only 

 having the rudiments of a crest, and in having the bill dusky yellow 

 and without corrugations. Birds of the year have the bill somewhat 

 intermediate, the primaries are pure white, but the crest is not fully deve- 

 loped, and both it and the neck are pure white. The nestling is covered 

 with white down, and even at this early age has the bill widened and 

 flattened at the tip. 



