THE NATURAL ENEMIES OF BIRDS 129 



The natural enemies of birds, noted as harmful by 

 the observers who have contributed to this portion of 

 the report, may be arranged in the following order, with 

 reference to the number reporting each : 



Natural enemy Number of ob- 



servers reporting 



Cats 82 



Foxes 58 



Crows 54 



Squirrels 42 



English sparrows 39 



Hawks 34 



Jays 26 



Owls 22 



The elements 21 



Weasels 17 



The enemies of birds may be arranged as follows 

 with special reference to the part that man has 

 played in their destruction: 



I. Natural enemies. 



1. Four-footed enemies. 



A. Squirrels. 



B. Foxes, weasels, etc. 



2. Feathered enemies. 



A. Crow, blue jay, crow blackbird. 



B. Hawks and owls. 



3. The elements. 

 II. Man as an enemy. 



1. Agencies for which man is indirectly responsible. 



A. The cat. 



B. The English sparrow. 



2. Agencies for which man is directly responsible. 



A. Unavoidable destruction. 



a. Cutting off timber and shrubbery. 



b. Draining marshes. 



c. Lighthouses. 



d. Wires (telegraph, telephone, trolley, elec- 



tric lighting). 



