BIRDS OF PREY 237 



PROBLEM 



Take the total number of acres of cultivated land in your 

 State, and suppose there are two field mice to each acre, 

 and that each mouse eats two cents worth of food per year. 

 What is the value of the food eaten by the mice? If the 

 hawks and owls eat one mouse for each two acres of land, 

 what is the value of food saved? 



