VERTEBRATA. 



331 



and feed on Fishes, Mollusks, and Insects. Examples are 

 the Cormorants, Pelicans, and Gannets. 



4. Lamellirostres, or Ducks, have a heavy body, moder- 

 ate wings, short tail, flattened bill, covered by a soft skin, 



FIG. 311. Wild Duck (Anas boschas). North America. 



with ridges along the edges. Diet more commonly vege- 

 tarian than animal. The majority inhabit fresh water 

 as the Ducks, Geese, Swans, and Flamingoes. 



B. TERRESTRIAL 

 BIRDS. This group 

 exhibits great diver- 

 sity of structure ; but 

 all agree in being es- 

 pecially terrestrial in 

 habit, spending most 

 of the time on the 

 ground, not on trees 

 or the water, al- 

 though many of them 



fly and SWim Well. PIG. 312. Sandpiper (Tringa hypoleuca). Kiiglaud. 



