88 



A FIELD GUIDE IN NATURE-STUDY 



aa Head, neck, and breast dark, 

 contrasting strongly with ad- 

 jacent light parts 

 o Back light 



x A narrow white ring 

 around neck; tail feathers 

 curled up 



xx No narrow white ring 

 on neck; tail feathers 

 straight 

 y Forehead low, bill 



long 



yy Forehead high, bill 

 short 

 z Head black; white 



spot on wing 

 zz Head red; no white 



spot on wing 

 oo Back dark, chin light, belly 



light 



YY Forward parts not in strong con- 

 trast to adjacent light parts but 

 shading into lighter belly; animal 

 variegated or spotted (in females 

 listed below spots not seen at a 

 distance) 



a Animal slaty blue with several 

 crescents and spots on head and 

 body 

 aa Animal not so marked 



o A dark comma running back 

 from eye 



x Top of head white 

 xx Top of head chestnut 

 oo No dark comma running 

 back from eye 

 x Wing with large blue 

 patch on it 



y Bill broad and spoon- 

 like 



yy Bill not broad and 

 spoonlike 



z Head gray, a white 

 crescent in front of 

 eve 



Mallard, male 



Canvasback 



Scaup, male 



Redhead 



Ring-necked Duck 



Harlequin Duck, male 



Baldpate, male 

 Green-winged Teal, male 



Shoveller 



Blue-winged Teal, male 





