lOO 



The Bird 



the chicken, in comparing it with our own, is to imagine 

 that our small toe has completely disappeared; the great 

 toe (corresponding to the thumb of the forelimb) is 

 turned backward, and the heel is lifted high from the 



Fig. 75. — Living 0.strich, showing entire leg; notice the knee ahiiost 

 within the body. 



ground, the several bones of the upper foot being greatly 

 lengthened and fused into one. So we, like bears and 

 raccoons, walk with our whole foot, from toe to heel, flat 

 upon the ground, while a bird, like a cat or a horse, walks 

 on its toes alone. 



