36 KEY TO DUCKS, GEESE AND SWANS OF NORTH AMERICA. 



GROUP VIII. 



Birds having wings over 19 inches long.* 



Head and neck, black ; a white patch on cheek. 



Canada Qoose. 



Branta canadensis. 

 See page 84. 



General plumage, white ; bill, lilack with j'ellow spot (adult) ; distance from 

 tip of Ijill to uostril, less than distance from nostril to eye (immature birds are 

 gray or brownish gray) . Common on some parts of the coast. 



Whistling Swan. 



Olor columhianiis. 

 See page 91. 



Olor cohimbiainis. 



General plumage, white; bill, black, showing no yellow; distance from tijj of 

 bill to nostril, more than distance from nostril to eye. Chiefly found in the 

 interior of iSTorth America, not common on the coast. 



Trumpeter Swan. 



Olor buccinator. 

 See page 91. 



' Directions for wing meaeureincnt, see page 6. 



