Page:First course in biology (IA firstcourseinbio00bailrich).pdf/412

 , of New Zealand. Size of a hen, wings and tail rudimentary, feathers hair-like.

Molting.—How do birds arrange their feathers after they have been ruffled? Do they ever bathe in water? In dust? Dust helps to remove old oil. At what season are birds brightest feathered? Why? Have you ever seen evidence of the molting of birds? Describe the molting process (page 120).

, males. Order? (Key, p. 177.) Ornaments of males, brightest in season of courtship, are due to sexual selection (Figs. 321-7-9, 333).