KEEL-BREASTED BIRDS. 269 
Fic, 301.—A group of night-birds—owls. 
stout, often enormous bills, the base, as in the hawks, cov- 
ered by a soft skin. The tongue is short and fleshy, and 
the beak of the upper jaw is articulated to the skull so 
that it is free to an unusual extent. They are, as a rule, 
