CHAPTER XXXII 



GROUPS OF ANIMALS 



General statement. Most animals which arc known 

 to man have been classified. By this we mean that 

 they have been placed in groups with animals which 



resemble one another. 

 It is interesting, even 

 to a beginner, to know 

 "something about the 

 groups of animals 

 and the forms which 

 belong to the different 

 groups. 



In some animals, 

 such as the fish or 

 bird, there is a sup- 

 porting frame work 

 in the body made of 

 bone. This is the 



skeleton. A part of 

 Fit 109. Skeleton of a pigeon. . ^ ^^ forms & 



structure known as the back bone or vertebral column. 

 All animals having a vertebral column are placed 

 together in one group, the vertebrates. Other animals, 



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