CHAPTER II 



The Caeinate or Keel-breasted BiudSj and Their 

 Chief Peculiarities 



THE birds to which the rest of this volume is to 

 be devoted all differ from the Ostrich tribe, not 

 only in the formation of the skull, but also in 

 that the breast-bone bears a deep plate, or "keel," 

 which runs down the middle of its under surface. In 



t^HOUL DER-StyipB. 



ThouchT- 



, Bf?e^sT So/f£ 



/(EBl. 



FiG. 10. — The shoItlder-girdle of a Carinate Bird 



TO SHOW THE KEEL OF THE BREAST-BONE, THE 

 LARGE MERRY-THOUGHT AND SEPARATE BLADE- 

 BONE. 



addition to this, the bones which are charged with the 

 support of the wings are different, not in kind, but 

 in degree. With the loss of the power of flight which 

 Ave remarked in the Ostrich tribe, these "shoulder- 



10 



