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KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



1. NORTHERN EIDER DUCK. 



2. AMERICAN EIDER DUCK. Male. 



6. AMERICAN SCOTER DUCK. Female. 



7. WHITE WINGED SCOTER DUCK. Male. 



11. RUDDY DUCK. Male. 



12. RUDDY DUCK. Female. 



3. AMERICAN EIDER DUCK. Female. 8. WHITE-WINGED SCOTER DUCK. Female. 13. MASKED DUCK. Male. 



4. KING EIDER DUCK. 



9. SURF SCOTER DUCK. Male. 



5. AMERICAN SCOTER DUCK. Male. 10. SURF SCOTER DUCK. Female. 



14. MASKED DUCK. Female. 



