70 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 
1. NORTHERN EIDER DUCK. 6. AMERICAN SCOTER Duck. Female. 11. RupDpy Duck. Male. 
2. AMERICAN EIDER DUCK. Male. 7. WHITE-WINGED SCOTER Duck. Male. 12. Rubpy 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. 14. MASKED Duck. Female, 
5 AMERICAN SCOTER DUCK, Male. 10. SURF SCOTER DuCK. Female, 
