GOLDENEYE (continued) 
5. Wi Length: 
ai oye fiten 210 ti, sho etonno sae see ee omens eee Immature Female 
(b) More than 215 mm, -nenennnn nen nnn nnn eee e wenn enennn= Immature Male 
(c) Between 210 and 215 mm, ---------------------------- Immature Unknown 
1/ If wing is shiny black, except for the greater coverts which are 
white, heavily tipped with black and their black bases show as a 
wide black band between a narrow area of white middle coverts, 
then if the most distal white middle coverts have conspicuous 
black centers, the bird is an adult male Barrow's Goldeneye. 
Adult female and immature Barrow's Goldeneye wings apparently 
cannot be separated from those of American Goldeneyes. 
BUFF LEHEAD 
Adult males have middle coverts that are entirely white except 
over the tertials. On immatures and adult females, middle coverts are 
black or brownish black. Adult females have tertials that are long 
and slightly drooping to rounded tips. Immatures have shorter, straighter 
tertials that are usually frayed to pointed tips. Adult greater coverts 
are rounded and unfrayed over the tertials. Immatures have narrow greater 
coverts that are sometimes slightly frayed. 
The above statements are based upon examination of about 25 known- 
age wings and several hundred wings of unknown age or sex. Because of 
this, these statements are largely hypothetical. 
KEY TO BUFFLEHEAD 
1. Middle Coverts: 
(a) Entirely white except over the tertials --------------- Adult Male 
(b) All black or brownish black -----------.--.---.-.-.-.-- 2 
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