Vol. XXIX1 

 1912 J 



Gross, The Yellow-hilled Tropic-bird. 



61 



twice the total length. Furthermore, the wings undergo their 

 greatest development during the last few weeks spent in the nest, 

 while the feet grow but little after the first month. This seems a 

 most favorable condition in view of the fact that the feet are 

 functional and necessary from the very beginning of the free life, 

 while an extensive development of the wings in the early part of 

 the life history would prove a great inconvenience. 



Table of Measurements. 



