4 The Wilson Bulletin — No. iU]. 



cleared of debris by the birds, and some of them had clearly 

 been made by the birds without much, if any natural cavity, to 

 mark the beginning. An occasional burrow was so shallow 



Carroll Islet. 



Figure 2 



Tufted Puffin (Liimla crrrhata). Posing for his 

 picture, at the mouth of the nest burrow. 



that the bird or egg" could be seen, but most of them extended 

 a number of feet into the ground. In walking over a turf- 

 covered steep slope one needed to be careful not to break 



