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KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



1. NORTHERN EIDER DUCK. 



2. AMERICAN EIDER DUCK. Male. 



3. AMERICAN EIDER DUCK. Female. 



4. KING EIDER DUCK. 



5. AMERICAN SCOTER DUCK. Male. 



6. AMERICAN SCOTER DUCK. Female. 



7. WHITE-WINGED SCOTER DUCK. Male. 



s. WHITE-WINGED SCOTER DUCK. Female. 

 9. SURF SCOTKR DUCK. Male. 

 10. SURF SCOTER DUCK. Female. 



11. RUDDY DUCK. Male. 

 1-2. RUDDV DUCK. Female. 



13. MASKED Drcic. Male. 



14. MASKED DUCK. Female. 



