28 



UNIVERSITY OF COLORADO. 



Swainson's hawk is known to live largely upon grasshoppers in the summer 

 and early autumn. 



The following table has been compiled from Fisher's great bulletin on 

 hawks and owls, to show at a glance what proportion of these birds of vari- 

 ous species take the various kinds of food, throwing the varieties of each 

 species together: 



Aughey (90) gives statistics from which the numbers of locusts and 

 other insects found in stomachs examined are computed by him as follows: 



(90) Aughey, First Rept. U. S. Entom. Com., App. II, pp. 42-45. 



