VERTEBRATA. 



329 



Fi&. 307. Loon (Cotymbus torquatus). North America. 



tribe have very short wings and tail, and the legs are 

 placed so far back that they are obliged, when on land, to 

 stand nearly bolt upright. They are better fitted for div- 

 ing than for flight, or even swimming. They belong to 

 the high latitudes, living on Fishes mainly, and are repre- 

 sented by the Penguins, Auks, Loons, and Grebes. 



2. Longipennes, or Gulls. Distinguished by their long, 



FIG. 308. Tern (Sterna). 



