
KEY TO GREATER SCAUP WINGS 
Sex Determination 
1. Upper Wing: 
(a) Any or all of the following: one or all of 
scapulars is more white than black. Tertials 
are flecked or vermiculated. Greater coverts 
are flecked particularly over the tertials -------- Male 
(b) All of the following: The scapulars are more 
black than white. Tertials are plain or have traces 
of flecking at tips. Greater coverts are unflecked- 2 
2. Middle Coverts: 
(a) Flecked to vermiculated --------------------------- 3 
(bh) Pigin, -e-ss--asenn eee e sense oe eee nest neonece Female 
3. Middle Coverts: (figure 1) 
(a) Individual coverts are completely flecked or 
vermiculated, or flecks are large but recessed 
1/8" from feather's edge ----------~---------------- Male 
(b) Individual coverts are flecked, generally with 
small flecks, primarily near their edges -------+--- Female 
figure 1 

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