Nov., 1909 A LIFE HISTORY OF THE NORTHERN BALD EAGLE 189 
feathers of the wings begin to molt first. I had no means of determining the ex- 
act length of the molting period. 
An alarm note is the commonest vocal expression of this eagle during the 
£ 
NEST OF NORTHERN BALD EAGLE (aT TOP CENTER) ON HAWKINS ISLAND, PRINCE 
WILLIAM SOUND, ALASKA 
breeding season and consists of a series of short guttural sounds uttered in quick 
succession, It always seemed to me as tho the bird was chuckling, even in spite of 
