American Black Duck 



Anas rubripes 



-w-w 



■w-w- 



t - - - t t - t 

 _t 



t - - t - t - - - - t 

 t t t - - 



t t - t - t - - 



Mallard 



Anas platyrhynchos 



UUwwUUUWUWU- 



UUUWWWWUww-M 



WWUWUwUUWUU 



-WWUWUUUw- 



wU 



Northern Pintail 



Anas acuta 



uu UW-- 



-U-wwww 



UWwU 



-wWW-WW--- 

 -W 



Garganey 



Anas querquedula 



QLL 14D; April 4, 1991; Charlo 

 n=2 



t 



18 



