19 



c, Webs between all toes (3 webs) 



Figure 6. 



Full-Webbed Swimmers Gannets, Cormorants, etc., p. 59. 



Figure 7. 



Figure 8. 



Figure 9. Figure 10. 



d, Bill toothed or flattened (Duck-like). 

 Sieve-billed Swimmers Mergansers, Ducks, Geese, and Swans. 



p. 62. 



e, Nostrils in tubes on top of bill. 



Tube-nosed Swimmers Petrels, etc. 



Figure 11. 



p. 56 



