174 



ANIMAL BIOLOGY 



Molting. — How do birds arrange their feathers after 

 they have been ruffled? Do they ever bathe in water ? 



Fig. 318. — Aptekyx, of New Zealand. Size of a hen, wings and tail 

 rudimentary, feathers hair-like. 



In dust ? Dust helps to remove old oil. At what season 

 are birds brightest feathered ? Why ? Have you ever seen 



& 



Fig. 319. — Golden, Silver, and Noble Pheasants, males. Order? 

 (Key, p. 177.) Ornaments of males, brightest in season of courtship, are due to 

 sexual selection (Figs. 321-7-9, 333). 



evidence of the molting of birds ? Describe the molting 

 process (page 120). 



