VERTEBRATA. 
331 
and feed on Fishes, Mollnsks, 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. Fig. 312.—Sandpiper {Tringa hypoleuca). England. 
