62 



NEW YORK STATE MUSEUM 



the percentage of stomachs containing various kinds of food than to try- 

 to estimate the percentage of each kind of food taken by the species. 

 Species marked g are near the border line of beneficial birds. 



Food of New York hawks and owls 

 Percentage of stomachs examined containing various kinds of food 



SPECIES EXAMINED 







^ s 





m 



u 



ft 



a 



H 



o 





U 



> 



a 



75 (« 



as U 





U u 



H S 



x 



::i ^ 



J <: 



u 



H < 



D o 



K 



c- Z 



o 



H 



w ^ 



Ou 







os^-^ 



o 







2 



o 



3 



18 



I 



6 



10 



1/3 



17 





10 



9 



4 



6 



27 



6 



3 



13 





I 



14 









4 









II 





1/3 



IS 



I 



5 



12 



I 



5 



25 





36 



8 





23 



49 



2 



4 



66 





35 



45 





4 



80 





25 



7 





tn 



-J 

 <: 

 s 



as S 

 w < 



K S 



H 



O 



a« 

 w 



« a 



>■ Q 



Beneficial 



Rough-legged hawk. . . 

 Broad- winged hawk. . . 

 Red-shouldered hawk . 



Sparrow hawk 



Red-tailed hawk (g). . . 



Marsh hawk (g) 



Bam owl 



Long-eared owl 



Saw- whet owl 



Short-eared owl 



Screech owl 



Barred owl (g) 



Snowy owl (g) 



Injurious 



Goshawk 



Cooper hawk 



Sharp-shinned hawk. . . 



Duck hawk 



Pigeon hawk 



Great horned owl 



19 

 i9(fish 2) 



4 

 3 

 2 



2 (fish i) 

 4 (fish 2) 



(fish 3) 



»i 

 22 



50 

 28 



50 

 46 



56 

 82 



79 



77 

 36 

 42 

 48 



4 



5 



4 



II 



10 



19 

 20 



4 

 24 

 18 



54 



5 



7 



5 



17 



5 



40 



53 



2 

 45 

 45 

 7.1 



8 

 10 



14 

 I 



5 



7 



40 



13 



12 

 2 



4 

 10 

 32 



6 



3 

 sp. 9 



sp. 1/5 



4(sp. 3) 

 9(sp. 2) 



10 

 7 

 9 



16 



7 

 22 



15 

 14 

 14 

 17 

 18 



33 



32 

 30 

 35 

 20 



9 



14 



Suborder S^^.RCORHATs.IPHI 



Family CATHA.RTIDAE 



American vultures 



Characters. Bill strong, elongated, hooked at the tip and blunt; 

 nostrils large, longitudinal and perforate; head and neck rather long, bare, 

 rough and usually bright colored; tongue thick and fleshy; eyes prominent; 

 feet clumsy and covered with small scales; front toes long, webbed at the 

 base; hind toe short and elevated; talons obtuse and only slightly curved; 

 wings very ample; 11 primaries; tail of moderate length, even or slightly 

 rounded, consisting of 12 or 14 rectrices; the basipterygoid process is present; 



