56 



BULLETIN 621, U. S. DEPARTMENT OF AGRICULTURE. 



digestible food as spiders and caterpillars, to the time when, fully 

 fledged, they relish hard-shelled beetles, crustaceans, small mammals, 

 and grain, a diet differing but slightly from that of the parents. The 

 series of stomachs examined includes young of all ages, and, as the 

 various stages of growth are about equally represented numerically, 

 the percentages derived may be considered as approximately a true 

 average for the nestling. A diagrammatic representation of the food 

 of these young birds is presented in figure 3 and a tabular statement 

 showing percentages is given in Table. IV, below. 



Fig. 3. — Food of nestling crows. The proportions of the various elements are represented 

 by the relative sizes of the different sectors. Table IV presents the same information 

 in percentages. 



Table IV. — Percentages of the principal food items of the nestling crow. 





A 





Jh 







B 



"3 . 





"o 





-o 



t3 



fl 





Fl 







to © 

 3 — 





■Q 





ft 

 ft 

 O 







o . 



03 T3 





g 



AS 





03 





03 







S^ 



1 





o 





03 



3g 



o 



si 



■3 j< 



03 ■£ 



fl to 

 60 



>> W> 



to" 



a. 



a 



o 



03 



o 





.2 ©3 



03 



3 = 



o 

 u 



o 



IV 



o 



O 



60 

 3 



m 



ft 



o 



I 



fe'G 



2 & 

 ft 9 



td 

 1 



c3 3 



ftr3 

 £ fl 



2 a 



H3 03 



U 60 



o 



a 



® 



o 



o 



fl 

 o 

 O 



° ® S 



17.44 



3.90 



2.59 



14.60 



2.61 



5.34 



1.88 



9.68 



1.78 



0.68 



7.04 



1.57 



1.60 



6.22 



2.61 



3.95 



11.91 



4 58 



