Heads and Necks 257 
of birds change, at the season of courtship, from a dull 
hue to some bright tint, either red, green, or yellow. 
Although eyelashes, as we understand them, are 
merely stiffened hairs which have been inherited from 
hairy-coated ancestors, yet among birds we sometimes 
find lashes similar in appearance and function, but struc- 
turally derived from feathers. The ostrich has well- 
rs 
Fic. 199.—Head of Seriema, showing eyelashes. 
developed eyelashes, which must be of value in helping 
to exclude the dust of the desert; but why such birds 
as hornbills and the Seriema should possess them we 
cannot say. 
A savage thrusts feathers into his hair, warriors of 
old bedecked their helmets with flowing plumes, the 
opera hat of milady is by way of wonderful and strange 
creations; but withal feathers are really beautiful only 
