Since December 20, 1922, male Barrow's Golden-eyes 
have been on view at Lynn practically every day, keeping 
within the range of a six-power glass from low to high tide, 
often coming close to the shore and well within fifty yards 
of the observer. With the best of light and the birds in 
the right positions, it is of course possible to identify them 
by the face marks alone, but the surest and easiest method 
at any distance is by the pattern of the wing coverts. As 
the males of the two species float side by side the difference 
of these markings is very easily seen. 
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