KEY TO FAMILIES. — WATER BIRDS. 15 
Lores, feathered; tarsus, reticulate (scales rounded) ; wing, more than thirteen inches long ; 
toes, four, the front ones full webbed. 
Family ANATIDAE. Subfamily ANSERINAE. Geese and Brant. 
See page 81. 
Geese and Swan. 
Lores, partly bare; tarsus, reticulate (scales rounded) ; size, large; neck, long; wing, ove 
eighteen inches long; plumage, white or gray. Subfamily CYGNINA=. Swans. 
See page 84. 
GROUP 3. 
Toes, four, toto=-palmate; (front toes, full webbed ;) 
hind toe, connected with front ones by web. 
Bill, sharp pointed: chin, feathered; toes, four, all connected by webs. 
Family PHAETHONTIDAZ. Tropic Birds. 
See page 50. 
Bill, stout, but not hooked; chin, bare; neck, thick; toes, four, all connected by webs. 
Family SULIDAE. Gannets. 
See page 51. 
