an educational campaign to enlist this cooperation. 

 Through the success of their efforts, combined with the 

 teaching of Nature in the public schools, there has 

 developed a sportsmanlike attitude on the part of hunt- 

 ers in general. Today Pennsylvania stands out promi- 

 nently as one of the great game states in the Union and 

 we now enjoy the privileges of a Commonwealth well 

 provided with abundant material for the study of wild 

 life. 



The Teeth of Mammals 



In the mammals the teeth display a great variety 

 of size and form, according to the manner in which 

 they are used. Inasmuch as mammals are usually some- 

 what limited in their diets, there have developed den- 

 titions so remarkable in character that one can differ- 

 entiate among animal groups, and even determine, to 

 a large extent, the diets of the various forms by observ- 

 ing the specialized character of their teeth. Some 

 mammals are addicted to strictly plant-eating habits, 

 others limit their food to the flesh of other animals, 

 w^hile still others are indiscriminate in their feeding 

 habits, devouring both plant and animal structures and 

 products. Consequently, there exists a wide variation 

 in the sizes, numbers, form and distribution of the 

 various tooth formations in mammalian groups. The 

 primary function of teeth is to seize and masticate 

 food. They are also, in many groups, excellent weapons 

 of defense and offense. The animals w^hich feed on 

 others are called CARNIVORES, or carnivorous animals. 

 Those which feed upon insects are called Insecti- 

 VORES, or insectivorous animals. Those which feed 

 entirely upon plants are called HERBIVORES, or herbi- 

 vorous animals. The Fox, Otter, Mink, Weasj 



