
WOOD DUCK (continued) 
Individual coverts of the juvenile plumage tend to show metallic 
blue only on the outer webs and the black terminal band is often 
slightly wider near the shaft of the feather. The most proximal 
greater covert is often greener and duller in the juvenile plumage 
than in the adult or first winter plumage. 
‘KEY TO WOOD DUCK WINGS 
Sex Determination 
1. Greater Tertial Coverts: 
(a) All iridescent deep bluish purple, 
greenish yellow or greenish ------------------------ 2 
(b) One or more iridescent pink or purplish pink ------- Female 
2. White trailing edge to Secondaries: (figure 1) 
(a) Much wider on outer web than on inner web-- 
usually in the form of a "tear-drop" -------------- Female 
(b) Approximately the same width on both inner 
and outer webs--generally flat uncurved 
margin on outer Web ------------------------------- Male 
figure 1 

Age Determination of Males 
1. Tertials and Scapulars: 
(a) One or more pale bronze, narrow, somewhat 
pointed, or with frayed tips --~-------- ween een n-- Immature 
(b) All deep bluish purple, wide ,"squarish", 
and with unfrayed tips ---------------------------- 2 
