182 BIRD STUDIES WITH A CAMERA 
until the bird is two years old, the question arises, 
What becomes of the immature birds during the 
nesting season ? 
97. Young Gannet. 
An estimate of the number of individuals repre- 
senting the seven species just mentioned as nesting 
on the Rock, is perhaps not warranted by my brief 
experience, nor should I attempt to give one, did not 
my photographs permit me to count with a fair de- 
gree of accuracy the number of birds in view on that 
part of the Rock shown in these pictures. Time 
was lacking to make, from a boat, a series of photo- 
graphs of the Rock which would include all its 
bird-inhabited portions, and the appended estimates 
are based on the results of a count of the birds in 
photographs of about one half the occupied area. 
Murres, Razorbills, and Puffins can not be distin- 
