GULLS AND TERNS—Family Laridse. 
IVORY GULL. 
39. Pagopliila alba. 17 inches. 
The little Snow Gnll, as it is often called, in the breeding 
season is entirely white; the bill is tipped with yellow and 
there is a red ring about the eye. 
Nest.- —Of grasses and seaweed, on the cliffs in the Arctic 
regions. Three grayish buff eggs are laid marked with brown 
and black (2.30 x 1.70). 
Range. —North of the Arctic Circle, and winters south to 
British Columbia. 
PACIFIC KITTIWAKE. 
40a. Eissa tridactyla pollicaris. 16 inches. 
These birds breed in immense rookeries on some of the isl¬ 
ands in the Bering Sea. 
2 q- es t;.—On almost inaccessible cliffs, made of sticks, moss 
and seaweed, making the interior cup-shaped, to hold the two 
or three eggs, which are buffy brown or grayish, spotted with 
darker shades of brown (2.20 x 1.70). 
Range. —Coast of the North Pacific, wintering as far south 
as Lower California. 
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