KEY TO GREEN-WINGED TEAL WINGS 
Sex Determination 
1. Tertials: 
(a) 
(b) 
Longitudinal stripe brownish, grading into basic 
feather color; one or more tertials edged with buff --- Females 
Longitudinal stripe black, clearly delineated from 
‘basic feather color; tertials buff-edged or solid gray-- 2 
2. Any of the following: 
(a) 
(b) 
Tertials solid gray unedged, black striped tertial 
more heavily edged with buff than others, with 
edging restricted to near tips, tertials often 
frayed at tips, vermiculated scapulars (may be) 
present. Wing usually 180 mm. or longer -------------- Males 
Tertials all about equally heavily edged with 
buff, unfrayed at tips, never have vermiculated 
scapulars. Wing 179 mm. or shorter ------------------- Females 
Age Determination of Males 
1. Any of the following: 
(a) 
(b) 
Tertials gray but buff edged, often frayed; greater 
tertial coverts long narrow with fine light edging, 
wispy tips, usually dull faded color; primaries 
tipped with cream; primary coverts heavily light 
edged; middle coverts appear ragged, gray appearing 
wear around edges, somewhat narrow and trapezoidal ~<-- Immature Males 
Tertials unedged, gray, not frayed; greater tertial 
coverts unedged, same color as middle coverts, 
usually smooth; primaries not tipped with cream; 
primary coverts unedged or nearly so; middle 
coverts appear smooth, edges show little or no 
wear, broad and smoothly rounded ------------+--------- Adult Male 
Age Determination of Females 
1. Any of the following: 
(a) 
Tertials buffy edged, tips frayed; tertial coverts 
narrow with fine light edging, wispy tips, often a 
dull faded color; primary coverts heavily light edged; 
middle coverts appear ragged, gray, wear around edges, 
somewhat narrow and trapezoidal ---------------------- Immature Female 
13 
