UNUSUAL EXPERIENCES AFIELD 95 



the most heroic of the birds of my personal ex- 

 perience. I am convinced that she brooded under 

 the conditions described without having once left 

 her nest from the time she entered it for night, about 

 four o'clock Sunday afternoon, until ten o'clock 

 Thursday morning — ninety hours. This experience 

 clearly proves that human mothers are not the 

 only ones who make sacrifices for their young. 



