KEY TO BIRDS 
Lower mandible much longer than 
upper. 
Skimmers 
c, Webs between all toes (3 webs). 
Figure 7 
Full-Webbed Swimmers — gannets, cormorants, etc 
d, Bill toothed or flattened (duck-like). 
Sieve-billed Swimmers — mergansers, ducks, geese, and swans 
Figure 8 
Figure 10 
Figure 11 
