BLACK-THROATED LOON 
9. Gavia arctica. 28 inches. 
This loon lives in the Arctic regions and only rarely 
is found, in winter, in Northern United States. In sum- 
mer, it can readily be distinguished from the common 
loon by the gray crown and hind-neck, as well as by 
different arrangement of the black and white markings. 
In winter, they are quite similar to the last species but 
can be recognized by their smaller. size, and can be dis- 
tinguished from the winter plumaged Red-throated Loon 
by the absence of any white markings on the back. 
Like the grebes, loons have to run over the surface ot 
the water in order to take flight, and they are prac- 
tically helpless when on land. Their flight is very rapid, 
in a straight line, and their neck is carried at ful! 
length in front. This species has red eyes, as do al! 
the other loons. 
Nest.—The same as the last species, but the two eggs 
have more of an olive tint and are smaller (3.10 x 2.00). 
Range.—Arctic America, wintering in Canada and oc- 
easionally in Northern United States. 
