24 
KEY TO BIRDS 
Key 
Figure 1 
Plumage areas of a typical bird. 
I. Feet Fully Webbed — Two or three complete webs to each foot. 
A, Toes, four. 
a, Tarsus flattened. 
Figure 2 
Loons 
p. 37 
b, Closed wing longer than tail, except in some jaegers (Figure 3) and 
terns (Figure 5), in which the rule only holds if the greatly elong- 
ated central tail feathers of the former or the outer ones of the 
latter are disregarded. Bills as below. 
Long-winged Swimmers — gulls, terns, jaegers 
p. 214 
