364 



Brooks, Notes on American Ducks. 



I Auk 

 [July 



The top views of the bills ofthe juvenal male and female islandica 



show a creator length as these are made from skulls, where there 

 is no feathering to cut off the extreme base when viewed in this 

 maimer. 



The differences in the trachea have been commented on before, 

 but it is as well to include them here, the figures illustrate these. 

 The sketches of courting amies are from a notebook, and were 

 made In the field. (Plates XV and XVI.) 



The most common form o( display in the drake is the 'swallow- 

 ing 1 or 'gulping' action, this may or may not be followed by a kick 

 which throws the water up behind. 'Chasing,' with the head 

 elose to or level with the water, anil the body Mink, always occurs 

 when one male invades another's territory. The pursuer often 

 dives and comes up under the intruder who then makes off at 

 great speed. 



1. Trachea of American Golden-eye. 



la. Harrow's Golden-eye. 



Continually between these amies the males preen themselves, 

 frequently turning over on the back. 



The females pay little attention to their lords, occasionally 

 they approach bobbing or pumping their heads up and down. 

 and turning the bill from side to side; more rarely they will join 

 in the chase oi an intruding male. 



