STERNUM OF THE WOODPECKER. 



351 



any point, still enable the bird to use its wings with 

 considerable effect. 



Woodpecker. 



The posterior angles of the sternum are divided by 

 two deep notches on each side, the processes between 

 which are enlarged at their extremities, and, except 

 the middle one, padded with cartilaginous discs ; 

 they thus protect the flanks of the bird far backward 

 with a strong cuirass, though flexible or elastic at the 

 sides. The continuation of the keel, however, renders 



