CLASSIFICATION OF THE BIRDS OF NORTH 

 AMERICA.* 



ORDER I.— PYGOPODES (DIVING BIRDS). 



Ducklike birds, witli generally sharply pointed bills; 

 feet webbed, placed far back near the tail ; tarsus much 

 flattened ; hind toe, when present, witli a lobe or flap ; 

 bill without tooth like projections ; tail very short, and 

 sometimes apparently wanting-. 



Family 1. — PocUcipidce. Grebes; 6 species. 

 Family 2, — Urinaioridoe. Loons; 5 species. 

 Family 3. — Ale idee. Auks, Murres, and Puffins ; 22 

 species. 



ORDER II.— LOXGIPENNES (LONG-WINGED 

 SAVIM3IERS). 



Birds witli sharply pointed and frequently hooked or 

 hawklike bills; toes four (except in the genus Rissa), the 

 front ones webbed : wings long and pointed. 



Family 4, — Stercorariidoe. Skuas and Jaegers; 4 spe- 

 cies. 

 Family 5. — Laridce. Gulls and Terns; 43 species. 

 Family 6. — Rynchopidce. Skimmers ; 1 species. 



ORDER III.— TUBINARES (TUBE-NOSED 

 SWIMMERS). 



Bill liawklike, the tip of the upper mandible generally 

 much enlarged ; nostrils opening through tubes ; hind toe 



* 'I'ho arrangement and nomenclature here given is based on the 

 American Ornithologist Union's Check-List, 2d edition, 1895. 



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