USE OF THE KEYS. 



33 



the most highly developed ones, Thrushes, Bluebirds, etc. Two main 

 divisions are given: first, Water Birds; second, Land Birds. In no 





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case will it be difficult to decide in which of these groups a bird be- 

 longs. Now glance over the illustrations and select the one which 

 you think most nearly resembles the bird you are identifying. At 

 4 



