CONTENTS. 



Page. 



Introduction 7 



Protection 8 



Causes of decrease in num bers of waterfowl 10 



Winter ranges 13 - 



Species that winter principally in the United States and southward . . 13 



Species that winter in the United States and Canada 13 



General remarks on migration 14 



Tables of distribution 15 



Species occurring in Central America, West Indies, or Mexico, but not 



known to reach the United States 16 



European species occurring in North America as stragglers 16 



Species that breed and winter north of the United States 16 



Species that breed chiefly north of the United States 17 



Species that breed chiefly north of the Arctic circle, with the north- 

 ernmost latitude at which the species has been observed in the 



Western Hemisphere 17 



Southern species, with northern limit of breeding range 17 



Western species, with eastern limit of regular range 18 



Southern limits of species whose winter range extends south of the 



United States.... 18 



Summary 18 



Distribution and migration of ducks 19 



Distribution and migration of geese 65 



Distribution and migration of swans 84 



Index 89 



5 



