KEEL-BREASTED BIRDS. 275 
tain the insects that are the objects of search. The tongue 
is long, flattened, and barbed, and by a peculiar muscular 
arrangement can be forced out with great velocity. 
Fic, 308.—Hornbill and yoting, cemented in their nest by the male, who 
feeds them through a hole left for the purpose. 
The ivory-billed woodpecker (Campephilus principals) 
is a typical American form, confined to the Southern States 
