





fc- ^^•Siai' 



■'"Sfi. 



Fig. 11. Upper — Crested White Drake. Lower — ^Young White 

 Muscovy duck showing black on top of the head. This is not an 

 unusual occurrence and the black is lost when the bird gets its 

 mature plumage in the fall. (Photographs from the Bureau of 

 Animal Industry, U. S. Department of Agriculture.) 



