104 



BIRD STUDIES WITH A CAMERA 



Swallows are not known to migrate by night, 

 and, so far as I am aware, no single Swallow has 

 ever been found among the thousands of night- 

 flying birds which have perished by striking light- 

 houses. The Swallows, therefore, when migrating 





51. Immature Tree Swallows gathering nesting material. 



probably leave the marsh during the day, but in 

 what manner who can say ? 



Several times when crossing the marshes on the 

 cars I have observed gatherings of Swallows which 

 made the immense flocks observed daily in August 



