THE REACTIONS OF BIRDS TO SOUND STIMULI 219 



10. I found the young of the hermit thrush during the first 

 ten days after hatching very little influenced by sound stimuli. 



11. A thirteen-day old hermit thrush very quickly learned 

 to associate certain sounds with feeding. 



12. Shore birds, chickadees, golden-crowned kinglets, and 

 brown creepers observed in the field were not visibly influenced 

 by sound stimuli. A slight response was obtained from a black- 

 throated green warbler. 



13. From a rather unsatisfactory study of young cedar wax- 

 wings it appears that they are more sensitive to sounds before 

 being fed than afterward. 



