The Framework of the Bird 99 
In the chicken, we next come to a single long bone 
called the tarsus, which is, in life, covered with scales. 
Fic. 73.—Skeleton of an Ostrich Fic. 74.—Human leg and foot. 
leg and foot. 
In the embryo it is composed of several separate bones.* 
The simplest interpretation we can give to the foot of 
* These correspond in ourselves to the bones of the upper foot and the 
second row of carpals, this joint of the leg coming, therefore, really between 
the bones of the ankle, instead of, as in ourselves, between the ankle and the 
lower part of the leg. 
